Four people were shot at a Harlem deli Wednesday afternoon, police said.

The gunman opened fire inside the 20 Stars deli on East 132nd Street near Madison Avenue around 3:30 p.m., cops said.

A 25-year-old man was shot in the head and a 17-year-old man was shot in the torso.

The chaos then spilled outside, with the shooter letting off several more shots that grazed a 43-year-old man and a 24-year old woman, according to police sources.

The victims were taken to Harlem Hospital, with at least one in critical condition, fire officials said.

The shooter is still on the loose and the incident is still under investigation.