A teenager was injured when he was punched in the face during a robbery Saturday night at a Riverhead park, police said.

Riverhead police said the incident happened shortly before 9 p.m. near Oakland Drive West.

Police said two teenagers told officers they were surrounded by a group of 10, including two females, while in the neighborhood park. Two males displayed knives and stole one victim’s sneakers and the other victim’s cellphone, police said.

One victim sustained a head injury when he was punched. He was taken to Peconic Bay Medical Center in Riverhead for treatment, police said.

The suspects fled.

Anyone with information can call the Riverhead Police Department at 631-727-4500.

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