A woman was slashed by a thief outside a Whole Foods in Brooklyn Monday night before a store security guard stepped in and detained the man at gunpoint until police arrived, police said.

The suspect approached the woman while she was sitting in her car at about 9:30 p.m. in the Whole Foods parking lot on Third Avenue near Third Street in Gowanus, cops and a witness said.

He then slashed her in the hands before she reversed out of the parking spot, authorities said.

“As soon as I heard the scream, she reversed and pulled out — fast,” a witness who asked not to be named said. “I thought like no regard — she’s just trying to get the freak out of there.”

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An armed store security guard saw the attempted robbery and intervened — training his gun on the suspect and detaining him until police arrived.

“He told people to call 911,” the witness said of the security guard.

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The suspect was taken into custody at the scene.

The woman was not severely injured.

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