Two teen suspects were arrested Tuesday over their alleged role in the brutal beatdown of a 44-year-old off-duty FDNY firefighter in a Queens park, police said.

The boys, ages 14 and 15, were turned over by their parents to police and subsequently charged with gang assault in the caught-on-video attack in Juniper Valley Park last Friday night, cops said.

A third suspect remains on the loose.

The unidentified juveniles are accused of ganging up on the victim, who was walking his dog, after he confronted a large unruly crowd of teens setting off fireworks and creating a ruckus in the park, according to the NYPD.

The man was eventually able to escape the mayhem and suffered some cuts and bruises, but refused medical attention.

His pooch, who was scooped up by a good Samaritan, was not hurt.

In the video footage, the mob can be seen closing in on their victim, who puts up his hands as his Labradoodle barks in protest.

“Give him a shot! Give him a shot! Give him a shot!” one teen repeatedly implores, the video shows.

“Yo, what the f–k!” shouts a stunned onlooker as the unidentified victim is pummeled on the pavement.