The incident happened around 2:50 p.m. outside a deli at 5022 Avenue M in the Flatlands section.
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Police sources say a gunman fired four shots, striking the teenager once in the head.
They say there were no words exchanged between the two, and there was no argument before the shots were fired.
The Department of Education says the victim works as a paraprofessional for District 75, located in the same building as PS 203 Floyd Bennett School.
He was shot less than a block from the school, and according to police sources, he was the intended target of the shooting.
The victim was taken to Brookdale Hospital, where he remains in critical condition.
Surveillance video obtained exclusively by Eyewitness News captured the moments leading up to the shooting.
The NYPD description of the gunman matched the man seen on the surveillance video. They say the suspect was wearing a red do-rag and a black parka over a red hoodie.
Moments after he passes the camera, you can see people react to the shooting.
Police say the have security camera video from several angles.
They say the gunman took off in a dark-colored Lexus.
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Authorities are asking anyone with information about the shooting, to come forward. The investigation is ongoing.
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