NOVATO (CBS SF) — Police are investigating a smash-and-grab robbery at a North Bay Costco store Sunday morning, according to authorities.

The thieves struck just after 10 a.m. Sunday morning at the Costco in Marin County just off Highway 101. A manager at the store confirmed the robbers targeted a  large display case in the jewelry department that was completely  emptied.

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Police say three men walked into the store wearing surgical masks and used a hammer to smash the glass cases and grab the jewelry.

Witnesses said the three suspects were all young African-American men.

The suspects ran away with at least one bag of jewelry and watches, according to a witness.

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The masked bandits race back out of the store and into a waiting car.

Police are now looking for the getaway car, a black Chevy Sonic with paper license plates.

Novato police hope this new surveillance video will help them find the Costco thieves.

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Sunday’s robbery is similar to two other jewelry heists in May at a Costco in Danville. Danville police made one arrest, after an employee tackled one of the masked burglars.