A crowd of people were seen cheering the shooting at the crime scene

They were operating in a new precinct for first time on Saturday at 3pm

On Sunday it was revealed that two Con Ed utility workers bravely confronted Brinsley just moments after his cold-blooded double murder

The grieving son of a New York City police officer shot dead execution style on a Brooklyn street Saturday has posted a heart-wrenching goodbye to his slain father to Facebook.

Jaden Ramos, 13, will never see his father Rafael Ramos again after he was murdered along with his partner 'just for being a police officer,' heartbroken Ramos said.

Once given the incomprehensible news, Ramos took to social media to publicly celebrate his adoring father and condemn his cold-blooded killer.

'Today I had to say bye to my father. He was their for me everyday of my life, he was the best father I could ask for. It's horrible that someone gets shot dead just for being a police officer,' Jaden posted.

Bereaved: Jaden Ramos wrote the moving message in a public post after his father was murdered yesterday

Paying tribute: As Ramos' son conveyed his sadness on Facebook, others paid tribute to the fallen officer with a makeshift memorial outside New York's 84th precinct Saturday

Honorable: Curtis Scott places flowers Sunday at a makeshift memorial for the two police officers who were shot there Saturday in the Bedford-Stuyvesant neighborhood of Brooklyn

He continued: 'Everyone says they hate cops but they are the people that they call for help. I will always love you and I will never forget you. RIP Dad.'

It was a somber addendum to an earlier December post in which he honored his dad's 40th birthday.

'Happy birthday to the best dad in the world, you are always there for me even when it's almost impossible,' he wrote December 9. 'We have so many good times it's not even funny, I love you so much.'

Jaden's wrenching tribute came Sunday as a heartbroken community in Brooklyn started a makeshift memorial of flowers and candles at the site of the slayings in the Bedford-Stuyvesant neighborhood.

Rafael Ramos was assassinated in the targeted attack alongside his recently-married partner Wenjian Liu on Saturday.

The pair were eating lunch in their patrol car at 2:47pm on Saturday when 28-year-old Ismaaiyl Abdullah Brinsley crept up behind their patrol car and shot them both in the head - before turning the gun on himself.

Gift: Jaden posted this picture online some days ago as a birthday present to his father

Salute: Maria Alomar salutes Sunday at a memorial in Brooklyn. Alomar's niece is an NYPD crime scene investigator. 'It could have been her in the car,' she said.

Tribute: A man tapes an American flag to a doorway as part of a makeshift memorial honoring police officers Rafael Ramos and Wenjian Liu

Ramos' cousin, Ronnie Gonzalez, insists their focus is on remembering the 40-year-old officer, father of two boys, rather than gunman Ismaaiyl Brinsley.

'[Brinsley] in the hands of God now,' Gonzalez told Pix11. 'We don't believe in vengeance, we just forgive.'

He added that Ramos was due to graduate as a chaplain this weekend.

'My cousin had a couple of priorities in his life,' Ronnie Gonzalez told the Wall Street Journal from outside the Brooklyn home where Officer Ramos grew up.

'One was God, because he was a God-loving man,' said Mr Gonzalez.

'I wish I could be half the man my cousin was. He was sweet. He didn't deserve…to die.'

In the brief interim between the killings and his suicide, the New York Post reports that Brinsley encountered two Con Ed workers as he wielded his handgun.

After they witnessed the murders, the workers approached Brinsley in order to stop what for all they knew would be his continued gun rampage.

'You want some of this?' he asked them as he raised the gun and forced the men to back down. He then entered a nearby subway station.

Once police arrived, the men were able to tell them where Brinsley had gone.

It was their first day working in a new precinct of Brooklyn's Bedford-Stuyvesant area.

Based on Brinsley's chilling Instagram posts hours before, the execution-style attack appeared to be a meticulously calculated act of revenge for the death of Eric Garner.

Liu, 32, married his fiancee two months ago - having joined the NYPD in 2007.

Love: The 40-year-old lived with his wife Margarita and celebrated his 40th birthday on December 12

Police Commissioner Bill Bratton said it is unlikely either had time to understand what was happened when Brinsley, an amateur rapper with a history of criminal convictions, stood by the front passenger window and fired a round of fatal shots into their heads.

Both were taken to Brooklyn's Woodhull Medical Center where they were pronounced dead.

The first official words from Ramos' family came at a press conference on Sunday night.

The officer's aunt, Lucy Ramos, told reporters: 'I would like to thank all those who have shared their sympathy and support for our beloved family member, Rafael Ramos, who will always be loved and missed by many.

'I hope and pray that we can reflect on this tragic loss of lives that has occurred so that we can move forward and find an amicable patch to a peaceful coexistence.'

She added that the family extends their condolences to relatives of Officer Liu.

Bratton and Mayor Bill de Blasio met with Liu's parents and new bride at the hospital on Saturday night, and Ramos' teenage son, who 'couldn't comprehend what had happened'.

'Quite simply, they were assassinated,' Bratton told a press conference.

Ramos lived with his wife Margarita, their son and her two other sons in Cypress Hills, where he grew up, four miles from the crime scene.

Tragic: Recently-married Wenjian Liu (left) and father-of-one Rafael Ramos (right) were shot dead while on patrol by Ismaaiyl Brinsley in a sickening act of revenge for the deaths of Eric Garner and Michael Brown

Targeted: Brinsley traveled 190 miles from Baltimore to stand by the pair's car and shot them in the head

His older son is college age, friends told Newsday.

'He was a very good guy; always tried to help out in the neighborhood,' neighbor Wendi Adams told the site.

'It's a really sad thing. It's just sad. God bless him.'

Liu lived in Brooklyn's Gravesend with his wife, having moved there five months before their wedding.

Brinsley shot his former girlfriend in Baltimore, Maryland, on Saturday morning before traveling 190 miles to New York City with the same gun for his second attack.

Tragically, Baltimore police faxed a bulletin describing Brinsley to New York police at 2.45pm - just two minutes before he fired his first deadly shot.

According to witnesses, Brinsley walked out of a home with a gun in his hand at 2.47pm, crept up behind the officers' patrol car, and systematically shot both men in the head through the passenger window.

He then walked to the Myrtle/Willoughby G train subway station where he shot himself in the head.

The brutal attack came two hours after he posted a picture of a gun on Instagram with the chilling message: 'I'm Putting Wings On Pigs Today.

'Heinous': Ismaaiyl Brinsley, 28, is believed to have planned his attack on the two innocent officers

Chilling: Brinsley told followers he would be 'putting pigs in a blanket' in apparent revenge for Eric Garner

After: Brinsley posted this image of his blood-stained trousers moments after the attack before killing himself

'They Take 1 Of Ours... Let's Take 2 of Theirs #ShootThePolice #RIPErivGardner (sic) #RIPMikeBrown.

'This May Be My Final Post. I'm Putting Pigs In A Blanket.'

According to NBC, Brinsley - who was armed with a semi-automatic pistol bought in Georgia in 1996 - may have been visiting his child, who is based in Brooklyn.

It came hours after he shot his 29-year-old former girlfriend in the abdomen at her home in Baltimore County, Maryland.

Detectives are now investigating whether Brinsley was a member of the Black Guerrilla Family (BGF), a large-scale gang in Baltimore that has been responsible for masterminding criminal plots behind bars.

Leaders of the group compiled a 'handbook' that was distributed to members in Baltimore Correctional Center, the Washington Post reported.

Investigators are also examining Brinsley's Instagram account - which has been suspended from public view - for clues of a motive.

His posts mention Eric Garner, the father-of-six who died in a police chokehold on Staten Island, sparking widespread outrage when a grand jury later decided not to indict anybody over the death.

Shooting: Officers flooded the street after the shooting. Witnesses says policemen chased down Brinsley

Sealed off: Witnesses uploaded pictures to social media of the street, which was cordoned off

One of Brinsley's friends, Awk Smith, spoke to DailyMail.com in Brooklyn - feet away from the crime scene - to describe how Brinsley had been 'acting strange' in the wake of the Eric Garner grand jury trial.

Father-of-six Eric Garner was killed by NYPD officer Daniel Pantaleo, who arrested him for selling loose cigarettes on the street, then held him in a fatal chokehold.

The killing provoked global outrage, sparked violent protests across the U.S., and exposed severe racial divisions in New York City.

Smith, who was a member of rap outfit P.Y. Gang with Brinsley, said: 'We all noticed he was acting different, it was kind of like he wasn't there when you spoke to him.

Another member of the group, Paul Yawney, said Brinsley took part in the recent anti-police protests.

Yawney said: ‘He posted motivational stuff on Instagram and went to the protests. I think this really came as a shock to a lot of us.

'He shot his girlfriend this morning then went to shoot those cops.

'It's scary to think that's what he was thinking.'

'They were quite literally assassinated': Commissioner William Bratton slammed the attacks at a conference

Emotional: De Blasio said it is not a time for politics, adding that the shooting is an attack on all New Yorkers

'When a police officer is murdered it tears at the foundation of our society. It is an attack on all of us.'

However, senior figures of the police department speaking later laid the blame on de Blasio for failing to quash anti-police sentiments in the city.

Hundreds of NYPD members turned their backs on de Blasio as he entered a news conference at Woodhull Hospital on Saturday afternoon.

A petition for de Blasio's resignation already amassed more than 5,000 signatures in just two hours.

A statement from the Patrolmen's Benevolent Association said: 'The mayor's hands are literally dripping with our blood because of his words, actions and policies and we have, for the first time in a number of years, become a "wartime" police department. We will act accordingly.'

Former New York City Police Commissioner Bernard Kerik echoed the statement, telling Newsmax: 'De Blasio, Sharpton and all those who encouraged this anti-cop, racist mentality all have blood on their hands.'