A state trooper was injured Saturday morning when a car spun out of control on the Northern State Parkway and slammed into his parked cruiser in Westbury, authorities said.

The trooper, who was not identified, was in his vehicle investigating a single-car accident at the time of the 7 a.m. crash, according to the State Police.

Authorities said a 2006 Honda Civic that had been in the left, westbound lane veered across the parkway and the two-lane Glen Cove Road exit ramp, where the trooper had pulled over.

The Honda spun as it went, striking the driver's side of the patrol vehicle with its back end, authorities said.

The collision left the trooper injured and trapped in his car.

The Honda driver, identified as Christopher Contaldi, tried to aid the injured trooper, but he cut himself as he climbed into the rear of the damaged cruiser, the State Police said.

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The trooper and Contaldi were treated at Winthrop-University Hospital in Mineola.

Police said the trooper's injuries were not life-threatening, but further details were not immediately available.

Authorities did not say what caused Contaldi to lose control of his car. The accident remains under investigation.

The Glen Cove Road exit was closed for 2 1/2 hours Saturday morning.