Thank goodness for surveillance cameras, or these teenage thugs would have gotten away with the unimaginable.

Fox News reports – One of the New York City teens wanted in connection with Saturday’s brutal assault of an FDNY firefighter was arrested early Thursday morning, the NYPD officials confirmed to Fox News.

Damir Johnson, 17, was charged with one count of second-degree assault after police identified him as a member of the group that assaulted the firefighter, leaving that man with several broken teeth and a concussion. Cops released an image on Wednesday of the six suspects, but they didn’t immediately identify which of the teens in the picture was Johnson.

Damir Johnson, center, is walked Thursday from the 19th Precinct on the Upper East Side. (Barry Williams/for New York Daily News)

New York Daily News reports – Saturday’s incident began when the unidentified 38-year-old firefighter, traveling on East 86th St. in Manhattan around 9:25 a.m., said he noticed the three males and three females — all thought to be between 15 and 17 years old — “harassing” an elderly couple.

When he tried to intervene, the off-duty firefighter was hit “with a closed fist” by one member of the group, police said. The sucker punch knocked the firefighter to the ground — at which point at least one member of the group continued assaulting the man. It’s not clear what role investigators believe Johnson may have played in the incident.

Police released surveillance footage of the six teens Wednesday and in less than a day had identified Johnson and taken him into custody.

Cops released surveillance video Tuesday of six teen suspects in the brutal assault of an off-duty firefighter who suffered five broken teeth after he tried to stop them from harassing a couple on the Upper East Side. The video shows the teens walking jubilantly down the street giggling and joking minutes after they allegedly jumped the 38-year-old firefighter on E. 86th St. near Third Ave. about 9:25 a.m. Saturday.

Cops busted a teen suspect in the savage assault of an off-duty firefighter on the Upper East Side — forcing the suspect’s mom to confront the idea her son has gone bad.

“Someone got hurt,” Florence Watson said Thursday of the incident that led to the arrest of her son, Damir Johnson, 17.

“I have some real serious issues with my kid here,” said Watson. “I just found out about this last [Wednesday] night …. I’m still trying to figure it out.”

Watson denied police sources’ statement that she told the cops who arrived at her Harlem home: “If you want him, he’s sleeping in the back room — he’s all yours.”

“I can’t imagine anyone saying that to the police — it’s nonsense,” Watson said.

More than a dozen fuming firefighters waited outside the 19th Precinct on East 67th St. Thursday when detectives escorted him outside on his way to an appearance in Manhattan Criminal Court.

“The New York Fire Department is like a family — you hurt one of us, you hurt all of us,” Gerard Fitzgerald, the president of the Uniformed Firefighters Association said. “The firefighters were just showing the support for one of our own and letting that firefighter know we are here to help.”

“It’s unacceptable for anything like this to happen in a civilized society,” Fitzgerald added. “If this guy is going to be a coward and act like a coward and hit someone from behind, he can face a few stares.”

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