Thieves rammed a stolen SUV into a downtown San Francisco museum early Tuesday and swiped historic gold nuggets in the latest smash-and-grab theftin the area in recent months.

Three masked men jumped from a Chevrolet Suburban after it rammed through a revolving door at the Wells Fargo History Museum in the financialdistrict and held a security guard at gunpoint while taking gold nuggets from a display case.

The three men escaped in a four-door sedan driven by an accomplice. The security guard was unharmed.

The tactic mirrored three other smash-and-grab thefts involving vehicles in the San Francisco Bay Area since May. Police said they areinvestigating whether there's a connection.

Police did not reveal the value of the stolen merchandise in any of the cases.

As many as 10 ounces of gold with an estimated value of roughly $10,000 was stolen from the Wells Fargo museum. Wells Fargo officials were stilltrying to determine exactly what was stolen before determining a more precise loss figure.

Dealers of precious metals say they will be on the lookout for nuggets with historical significance that suddenly appear on the market, rare coindealer Don Kagin said.

Melting the precious metal could remove possible markings concerning when and where the nuggets were mined, said Fred Holabird, a mining geologistand an owner of a rare and unique collectibles business in Reno, Nevada.

"This is such bad news from my viewpoint," he said, calling the potential loss of historical indicators a tragedy.

Holabird said the nuggets could be worth two to 10 times the value of gold now selling for about $1,300 an ounce on the open market.

Wells Fargo spokesman Ruben Pulido said in a statement that the company is grateful that no one was injured and no damage was done to the historicstagecoaches at the site where Wells Fargo launched in 1852.

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