San Bernardino, California (CNN) With the investigation still unfolding, much is unclear about Wednesday's deadly San Bernardino shooting at a center for people with developmental disabilities.

[Update 12:22 a.m ET Thursday]

The family has not been able to track down recently named suspect Syed Farook or his wife since Wednesday morning, said Hussam Ayloush, executive director of CAIR (the Council on American Islamic Relations).

Farhan Khan, the brother-in-law of the suspect Syed Farook, told reporters: "I have no idea why he would he do something like this. I have absolutely no idea. i am in shock myself." Khan said he last talked to Farook a week ago.

[Update midnight ET]

ATF tells CNN that one of the guns used in the shooting was legally purchased and traces back to someone believe to be connect with the shooting. The agency would not disclose the name of the purchaser.

[Update 11:56 p.m. ET Wednesday]

One of the suspects involved in the San Bernardino shootings has been identified as Syed Farook, an inspector with the county health department, who abruptly left the event at the Inland Regional Center before the shootings, multiple law enforcement sources tell CNN.

The sources said the residence in Redlands, California, surrounded by law enforcement is connected to Farook. It is that house where the chase began that led to the shootout with the occupants of the SUV.

The sources could not say for certain that he was in the SUV, if he was a shooter, or that he is one of the dead. The sources did say that Syed Farook is known to be a U.S. citizen.

[Previous story 11:56 ET]

Two suspects died in a gun battle with police Wednesday hours after authorities say they burst into a holiday party at a center for people with developmental disabilities and killed 14 people.

But it was unclear whether the furious shootout with the male and female suspects was the end of a daylong manhunt after the mass shooting at the Inland Regional Center in San Bernardino.

An FBI raid was unfolding late Wednesday at an apartment in Redlands, where authorities were serving a search warrant connected to the shooting.

Mass shooting

The violence began around 11 a.m. at the convention building at the Inland Regional Center where employees with the county health department were attending a holiday event. Witnesses said at least two shooters opened fire, killing 14 people.

Another 17 people were hurt -- many wounded by bullets from automatic-style rifles, some injured in the panic to escape.

The shooters fled in a black SUV, prompting a huge police response in the area.

As the hours passed, the hunt for the suspects continued with a tip taking officers to a home about 10 miles away in Redlands.

When detectives followed up on it, a black SUV with Utah plates passed by slowly then sped up and raced off, a law enforcement official close to the investigation told CNN. A police car spotted it and took up pursuit.

There was a shootout, the official said. The male suspect shot out of the vehicle while the woman drove. The SUV stopped a quarter a mile later, as an officer returned fire.

A device that looked like a bomb also flew out of the vehicle, Meredith Davis with the Bureau of Alcohol Tobacco and Firearms and Explosives told CNN affiliate KCAL/KCBS. The SUV was racing back toward San Bernardino, she said.

Photos: San Bernardino shooting Police officers stand guard as they investigate a suspicious vehicle in Redlands, California, on Wednesday, December 2, after a mass shooting in nearby San Bernardino in which 14 people died and 21 were injured. The shooting took place at the Inland Regional Center, where employees with the county health department were attending a holiday event. The two shooters -- Syed Rizwan Farook and his wife, Tashfeen Malik -- were fatally shot in a gun battle with police hours after the initial incident. Farook worked for the county health department. Hide Caption 1 of 29 Photos: San Bernardino shooting A police officer places a marker along East San Bernardino Avenue, near where the shootout occurred. Hide Caption 2 of 29 Photos: San Bernardino shooting Law enforcement officers search a residential area for suspects who fled after the shooting. Hide Caption 3 of 29 Photos: San Bernardino shooting Police search for the suspects in San Bernardino. Hide Caption 4 of 29 Photos: San Bernardino shooting The residential area was not far from where the shooting occurred. Hide Caption 5 of 29 Photos: San Bernardino shooting Law enforcement officers search a neighborhood in San Bernardino. Hide Caption 6 of 29 Photos: San Bernardino shooting A police officer loads his weapon while pursuing suspects. Hide Caption 7 of 29 Photos: San Bernardino shooting A SWAT team mobilizes during the search. Hide Caption 8 of 29 Photos: San Bernardino shooting People pray on the San Bernardino Golf Course, across the street from where the shooting took place. Hide Caption 9 of 29 Photos: San Bernardino shooting Heavily armed law enforcement officers swarmed the area where the shooting occurred. Hide Caption 10 of 29 Photos: San Bernardino shooting People leave a community center after reuniting with friends and family in the aftermath of the shootings. Hide Caption 11 of 29 Photos: San Bernardino shooting A woman is comforted near the scene of the shooting. Hide Caption 12 of 29 Photos: San Bernardino shooting A police helicopter hovers around the Inland Regional Center. Hide Caption 13 of 29 Photos: San Bernardino shooting Luis Gutierrez gets emotional as he talks about his wife who works in the facility and saw a gunman, according to Los Angeles Times photographer Marcus Yam. Hide Caption 14 of 29 Photos: San Bernardino shooting Two women speak with a firefighter at a triage area near the scene. Hide Caption 15 of 29 Photos: San Bernardino shooting Police stand guard outside of the emergency room at the Loma Linda University Medical Center, where some of the victims were being treated. Hide Caption 16 of 29 Photos: San Bernardino shooting Police escort civilians away from the site of the shooting. Hide Caption 17 of 29 Photos: San Bernardino shooting People walk away from the scene. It is unclear how many people were at the facility at the time of the shooting. Hide Caption 18 of 29 Photos: San Bernardino shooting Police in SWAT gear secure the area. Hide Caption 19 of 29 Photos: San Bernardino shooting Two women embrace at a community center where family members were gathering to pick up people from the scene. Hide Caption 20 of 29 Photos: San Bernardino shooting People gather at the San Bernardino Golf Course. Hide Caption 21 of 29 Photos: San Bernardino shooting People talk to police at the golf course. Hide Caption 22 of 29 Photos: San Bernardino shooting A woman is wheeled away on a stretcher. Hide Caption 23 of 29 Photos: San Bernardino shooting People are moved away from the area by bus. Hide Caption 24 of 29 Photos: San Bernardino shooting Police and fire personnel are seen near the site of the shooting. Hide Caption 25 of 29 Photos: San Bernardino shooting A crowd gathers behind the police line. Hide Caption 26 of 29 Photos: San Bernardino shooting Ambulances pull out of a staging area near the Inland Regional Center. Hide Caption 27 of 29 Photos: San Bernardino shooting A SWAT vehicle carries police officers. Hide Caption 28 of 29 Photos: San Bernardino shooting SWAT teams and a bomb squad were working to clear the buildings where the shootings took place. Hide Caption 29 of 29

Residents were stunned to hear the eruption of continuous gunfire. A barrage of bullets riddled the SUV's windshield.

A third person who was caught running near the scene was detained, but police aren't sure whether he was connected to either shooting.

The shooting occurred at the Inland Regional Center (1) in San Bernardino, California. Two suspects were shot and killed by police in a residential area (2) about two miles away hours after the initial incident.

Suspects dressed for assault

San Bernardino Police Chief Jarrod Burguan didn't say how old the suspects were or physically describe them in detail. He told reporters they were armed with assault-style rifles and handguns.

A law enforcement official told CNN the rifles were AR-15s or similar style weapons.

The man and the woman were dressed in what Burquan said was "assault-style clothing," describing it as "dark, kind of tactical gear."

He wouldn't say if he knew if they were related.

Witnessed text frightened messages

Hours after the shooting, the Inland Regional Center convention center was still an active scene. The bomb squad was working to determine whether they need to blow up two suspicious devices, one of which appeared to be a pipe bomb.

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Survivors of the mass shooting told of hiding in offices, bathrooms and closets, texting their loved ones that they feared they were next to be shot.

In the moments after the initial bloodbath, SWAT teams had scoured the facility, unsure whether the shooters were still there and looking for people hiding from the horror.

Marcos Aguilera received a text from his wife who works at the Inland Regional Center.

"She heard the shots and crying," he said. The situation became confusing when the fire alarm went off.

"Everyone was confused," he said, relating his wife's account.

A SWAT team eventually rescued his wife and two other co-workers. "When she exited the building, she said there were multiple bodies on the floor," Aguilera told CNN.

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The center's executive director, Lavinia Johnson, told CNN that she believed the county's Department of Public Health was having a holiday party.

Johnson said the fire alarm went off in her building, and people began to evacuate but then the order came to stay in place.

Later police came and took people out of their offices, marching them into the parking lot with their hands in the air.

San Bernardino is a city of just over 200,000 people 60 miles east of Los Angeles.