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Investigators say the vehicles were traveling in opposite directions on Avenue U in Marine Park when it happened.

According to police, a 2000 Mercury Mountaineer was traveling eastbound when it made a left turn onto East 34th Street and hit a 2008 Mazda CX7. Both vehicles then jumped the curb, forcing one to hit the plainclothes officer, who was standing with three others on the sidewalk.

The officer was taken to Kings County Hospital, where his left leg was amputated below the knee.

Residents say the intersection is known to be dangerous.

"They've had a lot, a lot of accidents here in the past 18 years," said one local. "I've always thought that they should have a traffic light because they try to, because of the park, I think they just run through to get to the next light, which is on 36th Street."

The officer is a five and a half year veteran and a member of the narcotics division.