Authorities in Charles County are seeking a Clinton man they suspect held up a Waldorf bank Wednesday by claiming to have a bomb and demanding money from a teller.

Christian Allan Boswell, 27, of Clinton, was charged Friday with armed robbery, first-degree assault, theft over $300 and threat of arson. Police said a search warrant executed at his home on the 7800 block of Westover Lane in Clinton recovered evidence linked to Wednesday's robbery.

Police were led to Boswell's home by an address label found among paper inside the box the bank robber claimed was a bomb.

Boswell remained at large late Friday.

"We believe he may still be in the area, but we're not sure," said Charles County sheriff's spokesman Craig Renner.

More than a dozen Waldorf businesses were evacuated for nearly three hours Wednesday after a man, who police now believe was Boswell, walked into the Old Line National Bank and handed a teller a note claiming he had a gun and a bomb and demanding money. The robber left a cardboard box on the counter after he fled with a bag of cash, the Charles County sheriff's office said.

Technicians from the state fire marshal's bomb squad later determined the "bomb" was a fake.