Nassau County police are investigating the slaying of an 18-year-old man who was shot multiple times on a Uniondale street late Friday, authorities said.

Detectives said First Precinct officers responded to a report of shots being fired shortly before midnight Friday and found the victim lying on Walnut Street, near Uniondale High School.

The victim, who was not identified Saturday, was standing in a crowd when two men rode up on bicycles, police said.

According to police, one of those men pulled out a handgun and opened fire. The pair then rode off on their bikes, leaving the victim bleeding on the pavement.

Police said the 18-year-old was taken to Nassau University Medical Center, where he pronounced dead at 12:34 a.m.

Investigators believe the victim was targeted because of a prior dispute, but they were still working on a motive. No arrests had been made as of Saturday night, police said.

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Residents of the normally quiet neighborhood were shaken by the eruption of violence — waking to sounds of police vehicles and investigators combing a taped-off crime scene.

“Just to hear something like this is so disheartening,” said Valerie Paul, 33, who substitute teaches at the high school. “I love this neighborhood. This neighborhood is great.”

“It surprises me and it scares me,” said another resident, Denise McLean, 63. “They have to put down the guns. Not until we get rid of the guns, is it going to stop.”

Detectives asked anyone with information about the shooting to contact Nassau County Crime Stoppers at 800-244-8477. All callers will remain anonymous.

With Lisa Irizarry