A man brandishing what turned out to be a BB gun was fatally shot by an off-duty police officer on Friday evening outside a Staten Island diner, the authorities said.

The shooting unfolded just after 8 p.m. after patrons of Andrews Diner in Eltingville called to report a man with a gun lingering behind the restaurant, according to Assistant Chief Melissa Eger, the Staten Island borough commander.

A short time later, two off-duty officers saw the man along William Avenue, a block from the diner, Chief Eger said at a news briefing. They identified themselves and ordered him multiple times to drop the weapon, she said. Surveillance video showed the man pointing the gun at the officers. One of the officers then opened fire.

The man, whose name has not yet been released, was taken to Staten

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