An NYPD patrol car caught fire after someone threw fireworks inside the vehicle as police were breaking up a crowd in Brooklyn early Sunday, authorities said.

Cops were dispersing people who gathered for illegal fireworks on Carlton Avenue near Lafayette Avenue in Fort Greene at about 2:30 a.m. when one of the explosive devices was thrown into the marked car, police said.

The inside of the vehicle caught fire, and officers had to use a fire extinguisher to put out the flames.

The officers were not injured, cops said.

There have been no arrests, and police are still investigating.