Nassau County police said they arrested one man on robbery charges and are looking for his accomplice after a series of holdups at gunpoint early Friday in Valley Stream.

Detectives from the Robbery Squad and Fourth Squad said the two men used a gun to commit two robberies and then were interrupted by a patrol sergeant during an attempted robbery.

Michael Davidson, 19, of 15 Oliver Ave., North Valley Stream, faces four counts of second-degree robbery, two counts of second-degree assault and criminal use of a firearm, police said. He is scheduled to be arraigned Friday at First District Court in Hempstead.

Police said they are looking for another suspect who was with Davidson when the robberies began at about 11:15 p.m. Thursday, on Sunset Road.

The two suspects approached a man and woman, each 18 years old, police said. Davidson displayed a handgun, and his accomplice took each of the victim's cellphones.

Both Davidson and the other suspect then entered a white Suzuki sport utility vehicle that drove away toward Fletcher Avenue.

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At 11:45 p.m., Davidson and the other man each displayed handguns as they tried to rob two victims on Fenwood Drive and Waverly Place; the two victims ran off, police said.

A short while later, at the same location, the two suspects did rob a man, 22, of his cellphone, and the victim also was struck in the face, police said.

The two suspects ran off on foot, police said, before a patrol sergeant interrupted them at 11:59 p.m. attempting to rob another person at Merrick Road and North Waldinger Avenue. Both men fled, with police giving chase.

Police said Davidson discarded a handgun in the front yard of a home on North Montgomery Street, near Martens Avenue.

As officers tried to arrest him, Davidson struggled; one sergeant injured his right knee in the chase, and another officer broke a finger on his left hand, police said. Each officer was treated and released at a nearby hospital.

Detectives ask that the victims of the attempted robbery on North Waldinger Avenue to call the Robbery Squad at 516-573-8040.