MALIBU (CBSLA.com) — Authorities are trying to figure out how a grenade washed up on the shore of Paradise Cove in Malibu.

Deputies were notified at 1:13 p.m. Thursday, said. Sgt. Wright of the Los Angeles County Sheriff’s Department Malibu Lost Hills Station.

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The grenade was found at a popular tourist destination and home to the bustling Paradise Cove Beach Cafe.

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“Obviously it was safe enough to take away,” Wright said.

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It’s unclear where the device came from and what kind of grenade it was.

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