Live feed footage from Boston shows one of the shooting suspects on the ground, surrounded by Police. Credit: Sky/CNN

Footage shows one Boston suspect on the ground

ONE suspect is dead and police are hunting another armed man in Boston, as police confirm the unfolding events are linked to the Marathon bombings. LIVE UPDATES BELOW.

11.40PM AEST:

Connecticut State Police say the suspect may be driving a gray Honda CRV registration 316 ES9 Massachusetts.



11.30PM AEST:

An explosive trigger was found on the dead brother’s body at the morgue, according to The Boston Globe.

RT @jtuohey21: An explosive trigger was found on the dead brother’s body at the morgue. b.globe.com/11pnNqP — The Boston Globe (@BostonGlobe) April 19, 2013



11.25PM AEST:

BREAKING NEWS: MIT police officer killed in confrontation with terror suspects was Sean Collier, 26, of Somerville, per Middlesex DA. — Boston Globe News (@GlobeMetro) April 19, 2013

Authorities have identified the transit officer shot in suspected bomber shootout as 33-year-old Richard Donohue, according to wcvb.com.

11.20PM AEST:

An uncle of the suspects who lives in Maryland has told CNN that one of his nephews yesterday asked him for forgiveness.

"Yesterday he called me and he said ... forgive me," he said.

"It's crazy. It's not possible. I can't believe it."

11.10PM AEST

The father of Boston bombing suspect says son is accomplished medical student and 'a true angel', according to Associated Press.



BREAKING: Father of Boston bombing suspect says son is accomplished medical student and 'a true angel'. — The Associated Press (@AP) April 19, 2013

10.45pm AEST:

BREAKING: Police have surrounded an address on Willow Park in Watertown, according to the Boston Globe.

BREAKING: Police have surrounded an address on Willow Park in Watertown in hunt for Marathon terror bomb suspect. — The Boston Globe (@BostonGlobe) April 19, 2013

10.40PM AEST:

Watch the latest video at &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;a href="http://video.foxnews.com"&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;video.foxnews.com&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;/a&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;

Media in Boston are reporting a distinct and heavy smell of smoke.

Activity on Quimby Street and Willow Street... Scanner: suspect confirmed as wearing suicide jacket #watertown — Watertown TAB (@watertowntab) April 19, 2013

10.30PM AEST:

Dzhokhar A. Tsarnaev, the 19-year-old suspect being hunted by authorities, attended the Cambridge Rindge and Latin School.

9.50PM AEST:

A law enforcement intelligence bulletin obtained by the The Associated Press identified the surviving bomb suspect as Dzhokhar A. Tsarnaev, a 19-year-old who had been living in Cambridge, just outside Boston, and said he ``may be armed and dangerous.''

Two law enforcement officials told the AP that Tsarnaev and the other suspect, who was not immediately identified, had been living legally in the U.S. for at least one year.

Timothy Alban of the Massachusetts State Police urged the public to be patient.

"We need more time," he said.

"We’re making significant progress up there but it may take hours to do this.

"Please give us that leeway."

All taxi services in the City of Boston have been suspended pending further notice.

9.30PM AEST:

The New York Times has quoted a law enforcement official as saying that the suspect who was killed is Tamerlan Tsarnaev and that his surviving brother, who remains on the run, is Dzhokhar A. Tsarnaev.

There are conflicting reports about the deceased man's age.

9PM AEST:

The Associated Press is now reporting that both suspects are brothers from Chechnya, Russia.

Suspect number two is allegedly a 19-year-old male who was given a $2,500 scholarship for high school students by City of Cambridge in 2011.

This conflicts earlier reports that the surviving suspect was a missing American Ivy League student.

Suspect number one, who has been killed, is reportedly aged 20.

8.30PM AEST:

DEVELOPING: There are unverified reports that a taxi has been pulled over on Commonwealth Ave in Watertown and that two people have been handcuffed.

7.50PM AEST:



All public transit services in and out of the Watertown area have been immediately suspended “as a safety measure” at the request of police.



Boston police have urged the public to stay at home and to stay indoors.



“We’re asking businesses not to open and asking people not to congregate outside,” the police said.



“This situation is grave.



“We believe these (suspects) are the same individuals that are responsible for the bombings at the marathon on Monday. We believe they are responsible for the fatal shooting of an officer today."

Meanwhile, President Barack Obama has been brief of the situation overnight.

7.30PM AEST:

A doctor at Beth Israel Hospital in Watertown said the adult male patient - known as suspect one - was brought in under heavy police guard in a state of cardiac arrest.

They worked on him for 15 minutes but could not save him.

The doctor said the patient’s body had suffered extreme trauma to his trunk area.

“We believe a combination of blast and gunshot wounds,” he said.

“An explosive device plus shrapnel... throughout the trunk it was multiple wounds.

“There were signs of more than just gunshot wounds.”

The patient was pronounced deceased at 1.35am.

6.59PM AEST:

The District Attorney has released a statement providing details about the events that led to the current situation.

After the fatal shooting of the police officer at MIT college earlier, two men were involved in a carjacking. They took a hostage for half an hour before dropping him unharmed at a petrol station.

Police then began an intense hunt for the men, now confirmed as the Boston Marathon bombing suspects. The men threw explosive devices from the car as they were pursued in a dramatic chase through Watertown.

During this pursuit, the deceased suspect was critically injured and transported to hospital. He was declared dead on arrival.

The Massachusetts State Police Bomb Squad is assessing all objects thrown from the vehicle during the chase, to determine whether they are explosive.

An extensive manhunt is ongoing for the second suspect.

District Attorney statement: How today unfolded

6.38PM AEST:

A suspicious package has been reported in the area of 500 Memorial Drive. Please stay away from this area until further notice.

Police have issued stern warnings to the public not to open their doors.

"We believe this to be a terrorist. We believe this is a man who has come to kill people".

Police radio says the suspect who died may have had an explosive on his chest which detonated when he was detained.

There are now concerns the second suspect, who is still on the run, may also have explosives attached to his person.

6.25PM AEST:

The police commissioner has said in a press conference that a suspect "consistent with description of…the white-capped individual" from this week's Boston Marathon bombings is being pursued by authorities.

6.19PM AEST:

Boston police have confirmed a transit officer is in a critical condition in hospital after a gunfight with the deceased suspect.

6.09PM AEST:

Boston Police Commissioner Ed Davis has confirmed that the "black hat" suspect - from the FBI photos of the Boston bombings - is dead. White hat suspect is still at large.

This is the first official link police have established between the Boston Marathon bombers and today's events.

One suspect dead. One at large. Armed and dangerous. White hat suspect at large. — Edward Davis (@EdDavis3) April 19, 2013

6.06PM AEST:

The suspect on the run from authorities is leaving a trail of explosives behind him and is armed with a rifle.

5.53PM AEST:

Local Boston TV claims one of the suspects has died and the other remains at large.

There will be a controlled detonation of a device discovered in the area as the FBI release a short statement on their website.

5.45PM AEST:

Reports on police radio and social media have named the suspects. One of the suspects is believed to be a college student who was reported missing in mid-March. Authorities have not officially commented on these claims.

As locals are warned to remain inside and tweet whether they are safe, a transit officer is being treated for a gunshot wound.

If any concerns about someone at door, call 911 immediately. Repeat--Do not answer door, stay away from windows, keep doors locked. — MASS STATE POLICE (@MassStatePolice) April 19, 2013

5.30PM AEST:

Authorities tell The New York Times they are investigating a link between the Boston marathon bombings and today's events. Boston police have announced they will hold a press conference shortly.

"We're investigating that and the FBI is investigating that," police said.

5.11PM AEST:

The foot pursuit has been called off and a directive has been issued on police radio to make sure officers "are not chasing ghosts".

A pressure cooker has been discovered at the Watertown crime scene, NBC News reports.

Local TV outlet WCVB says there is a "strong link" between Watertown and Boston bombing.

5.03PM AEST:

Police have a suspect in custody and another has not been accounted for.

A light-skinned, white male should be considered armed and dangerous, police radio reports.

He is wearing a grey hoodie and may be armed with explosives.

SWAT police are in foot pursuit in a 20-block area.

WHAT WE KNOW SO FAR:

A policeman was shot and killed at the Massachusetts Institute of Technology, a university within walking distance of this week's Boston marathon bombings

Suspects armed with grenades and firearms are then commandeered an SUV

A wild police chase from the university to the nearby suburb of Watertown then followed

Gunfire and a series of explosions were heard by residents

It is believed suspects were carrying firearms and homemade explosives

State police said suspects were throwing grenades out of the stolen vehicle

It is understood there are two suspects

One person was stripped naked and taken into custody and has now reportedly been released

Soldiers from the National Guard, the FBI, state and local police are on the scene

"One more suspect is at large. One is accounted for." - State Police

4.51PM AEST:

Police radio said a man wearing a white hat in FBI photographs of the Boston bomb suspects is at large in the Watertown neighbourhood.

"Party outstanding is the one with the white hat that was identified in the photos," police radio says.

4.42PM AEST:

A Boston marathon bombing suspect is in custody, the Boston Globe claims. A link between today's incidents and the bombings have not been confirmed officially by any law enforcement officials.

4.35PM AEST:

The NY Times reports two men engaged in a stand-off with scores of police in Watertown, Massachussetts.

The men appeared to be carrying explosives in backpacks.

Witness Andrew Kitzenburg said he looked out of this third floor window to see two young men shooting at police officers. They were hiding behind a black Mercedes SUV. The officers and the men were engaged in “constant gunfire.”

4.29PM AEST:

Fifteen shots have now been heard at a property in Mount Auburn, a neighbourhood of Boston.

4.13PM AEST:

A Watertown house at 14 Hazel St has been surrounded by the SWAT team.

A suspect has been identified as a male in his 20s, the Boston Globe reports.

4.02PM AEST:

"It's crazy over there," a Somerville police officer at Massachusetts General Hospital has told the Boston Globe. "They're throwing hand grenades."

The SWAT team, Cambridge, Boston and Watertown Police, as well as Homeland Security and the ATF are searching the area.



3.52PM AEST:

Witnesses have taken to social media, tweeting loud explosions and gunfire are rocking the neighbourhood.

Bullet hole through our wall and the chair on the second floor, slug beside #mitshooting #mit #boston twitter.com/AKitz/status/3… — Andrew Kitzenberg (@AKitz) April 19, 2013

About 500 shots, 4 small explosions one big boom outside my house. What in all hells — Kristian Tuinzing (@Dutchguy000) April 19, 2013



Here's a pic of Suspect 2 from #MIT being arrested twitter.com/sethmnookin/st…Home video of Watertown arrest w shots facebook.com/video/embed?vi… — Seth (@sethweis) April 19, 2013

3.37PM AEST:

Follow the dramatic developments on the police scanner

Another large explosion has been heard in the vicinity of Watertown.

The status of the second suspect remains unclear.

3.26PM AEST:

A person of interest is currently on the ground, surrounded by armed police, as air support is called in.

3.21PM AEST:

Reports are emerging there are two suspects, a male in a white t-shirt and an unidentified person. Police have an SUV in their possession, it is believed the vehicle was used to flee the scene of an earlier fatal shooting at Massachusetts Institute of Technology.

Cops emerging with man in custody. — Wesley Lowery (@WesleyLowery) April 19, 2013

3.10PM AEST:

One suspect is on the way to the hospital as a second suspect is being held at gunpoint.

LIVE: One suspect is en route to hospital; second Boston suspect is being held at gunpoint- bit.ly/YLeUf3 — Matthew Keys (@TheMatthewKeys) April 19, 2013

3.07PM AEST:

The bomb squad is en route to the crime scene in the Watertown neighbourhood of Boston, as officers are told to shut down mobile phones, as they could possibly detonate explosives.

2.59PM AEST:

Automatic gunfire has been reported from a stolen vehicle in a Boston neighbourhood, as police are ordered to pull back from a car chase involving the suspect of a police shooting.

Police say hand grenades have been thrown from the SUV, which is being driven by a suspect involved in an earlier incident at Massachusetts Institute of Technology (MIT) in Boston.

MAP: Officer reportedly down at Hazel & Dexter in Boston - twitter.com/TheMatthewKeys… — Matthew Keys (@TheMatthewKeys) April 19, 2013

2.52PM AEST:

There are reports of multiple police cars speeding in the opposite direction from MIT with their sirens blaring after a possible carjacking.

Large explosions have been heard on a Boston police scanner, as shots have been fired and 'explosions are being detonated'.

LIVE: Police chasing suspects in Boston, suspects appear to have explosives and are firing shots - bit.ly/YLeUf3 — Matthew Keys (@TheMatthewKeys) April 19, 2013



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2.39PM AEST:

A policeman was shot multiple times and died as a result of his injuries during an incident at MIT.

A statement issued by the Middlesex District Attorney Michael Pelgro said:

"An MIT campus police officer responding to a report of a disturbance in the area of Vasser and Main streets was reportedly shot. According to authorities, the officer was found evidencing multiple gunshot wounds.

"He was transported to the hospital and pronounced deceased."

Police, DA Investigating Fatal Shooting of Campus Police Officer In Cambridge. #CambMA #MIT — Cambridge Police (@CambridgePolice) April 19, 2013

At 10:48pm gunshots were reported near campus Building 32 (Stata).

Police are swarming the cordoned-off area and the situation at MIT is said to be active and dangerous.

Responding agencies continue to investigate active shooter incident atbuilding 32 (Stata). Please stay indoors and away from the area. — MIT (@MITnews) April 19, 2013



No other victims have been identified and no arrests have been made, police say.

The university said in one of their earliest updates: "Responding agencies continue to investigate the situation. The scene is outside of Building 32 (Stata) and 76 (Koch) near Vassar and Main Streets. Injuries have been reported. The situation is still very active and we ask everyone to stay inside."

MIT, located in the Boston suburb of Cambridge, is one of America's most highly regarded universities. It is within walking distance to the site where two bombs killed three people and injured 180 at the city's famous marathon on Monday.

No link has been established between the two events.