Suffolk police investigate a robbery by a man with a...

Suffolk police investigate a robbery by a man with a knife at a Lake Grove Dunkin' Donuts on Friday, Dec. 22, 2017. Credit: Stringer News Service

A man with a knife robbed a Dunkin’ Donuts in Suffolk on Friday night, Suffolk police said.

He demanded cash about 7:40 p.m. from employees at the Lake Grove store on Middle Country Road, then ran off with the money, police said.

Fourth Precinct detectives are investigating, police said.

No other details were released.

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