Just before 8 p.m., the teen was crossing through the intersection westbound at William Floyd Parkway and Adobe Drive in Shirley.
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According to police, the officer was driving southbound on William Floyd Parkway with her vehicle's lights and siren on, passing through a green light when she struck the teen.
After colliding with the bicyclist, the police officer struck another vehicle stopped in traffic, a tree and two parked cars.
The officer was responding to a report of an elderly woman in medical distress, police say.
The officer driving the police vehicle has not been identified.
The teen and the officer were transported to a local hospital. The officer suffered minor injuries and was released.
The extent of the teen's injuries is not yet known, and there were no other reports of injuries.
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The Suffolk County Police Major Case Unit is investigating the crash. Detectives are asking anyone with information to call the Major Case Unit at 631-852-6555.
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