Four people were shot in a drive-by in Queens Tuesday evening — leaving one in critical condition with a gunshot wound to the head, police and sources said.

Gunshots rang out just after 5 p.m. at 34-03 21st Ave. in Astoria as a blue Jeep drove by and a triggerman fired from the SUV, police said.

A 21-year-old man was shot in the head and was in critical condition Tuesday evening, sources said.

A 17-year-old was hit by the gunfire in the back and a 19-year-old was struck in the leg, according to sources.

Another 18-year-old fell victim to the gun violence, but the extent of his injuries was not immediately known, police sources said.

The Jeep took off west down 36th Avenue, source said.

There were 10 people shot on Monday, including a man who was struck in a drive-by shooting in Brooklyn, according to cops.