Published: Aug 20, 2010 3:55 PM EDT
Updated: Aug 20, 2010 12:55 PM EDT

KEY WEST, Fla. (AP) - They may not be Thomas Crown or Danny Ocean, but two thieves reportedly made off with a gold bar worth about $550,000 from a Key West museum.

Police and the FBI are working to identify the two suspects, who stole a historic gold bar this week from the Mel Fisher Maritime Museum.

The 74.85-ounce bar had been on display at the museum for more than 20 years. It was locked in a see-through case that allowed visitors to touch and lift it, while keeping it secure.

Security footage shows the suspects breaking into the case at about 5:15 p.m. Wednesday, shortly after the museum closed for the night.

The bar was found in 1980 at the Santa Margarita shipwreck off the Florida Keys.