A bar patron was arrested early Saturday after he allegedly threw a beer bottle at another man's face, causing injuries, Riverhead town police said.

Diego Abrego, 23, of Riverhead, was charged with second-degree assault for allegedly throwing the bottle at Pablo Castro, 27, also of Riverhead, at the Royal Dorado Bar, 1005 E. Main St., about 1 a.m., police said.

Castro was taken to Peconic Bay Medical Center and treated for his injuries, which police did not specify. Abrego was treated there for a small laceration to the top of his head, police said.

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Authorities did not say how Abrego got the laceration. He was later arrested and taken to Riverhead Police headquarters. It was not immediately clear if he had a lawyer or had gone before a judge Saturday.

Police ask anyone who witnessed the assault to call their detective division at 631-727-4500, ext. 328.