Cops are looking for at least four men believed to have set off the fireworks that flew through a window and burned a 3-year-old boy.

The toddler, Adiel Rosario, was watching the display with his 17-year-old sister inside their apartment on West 167th Street at Anderson Avenue in The Bronx at around 12:10 a.m. Wednesday when a projectile suddenly ripped through the open sixth-floor window, striking him, according to cops and the boy’s family.

He was rushed to Manhattan’s NewYork-Presbyterian/Columbia Hospital with burns to his left arm and stomach. He has since been released.

Cops said Thursday that the suspects were last observed retrieving fireworks from a gray, Ford Fusion sedan with Pennsylvania license plates.

Footage of the dramatic incident was tweeted by NYPD Chief of Detectives Rodney Harrison on Wednesday.

Police initially said one person was in custody with charges pending, but as of Thursday morning, no one was being held.

The incident ignited calls from the tot’s furious father for Mayor de Blasio to crack down on fuse lighters — and not just the fireworks peddlers that Hizzoner has already pledged to go after.