Police said a man held up the Island Dollar store...

Police said a man held up the Island Dollar store in Shirley on Sunday night, Feb. 25, 2018, and fled with an undisclosed amount of cash. Credit: T.J. Lambui / LiHotShots

Police are investigating an armed robbery at a Shirley discount store on Sunday night, authorities said.

A man with a knife demanded cash from a clerk at Island Dollar at 579 Montauk Highway around 6:30 p.m., a Suffolk County police spokesman said.

The clerk handed over the money and the man fled, police said.

The department’s Seventh Squad detectives are investigating the holdup.

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