A fire that gutted the attic of a doctor's office early Saturday in Calvert County was caused by a bolt of lightning, according to the State Fire Marshal's Office.

A receptionist at the office of Kioumarce Yazdani at 2555 Solomons Island Rd. in Huntingtown said the practice is still open despite heavy smoke and water damage in the building. Yazdani did not return calls seeking comment Tuesday.

The building sustained about $150,000 in damage, said Deputy Don Brenneman, the investigator in Calvert County for the State Fire Marshal's Office. He said he knows of only two other times in the past two years when lightning struck a building in the county.

"We had a real vicious electrical storm that came through that evening," Brenneman said. "And what happened was once it struck, it just simmered. The surge went through the lines and it found a weak spot, and it just sat there until it got enough oxygen and ignited."

Brenneman said the blaze was contained to the building's attic and did not enter into the building's second floor. He said it was not clear how much damage was done to the building's equipment.

Brenneman said the two-alarm fire about 3 a.m. summoned firefighters with up to 10 firetrucks, including four tankers. Firefighters doused the blaze in about 15 minutes, he said.

"It's Mother Nature. What can you do?" Brenneman said. "You can duck and hide all you want, but she sends a bolt of lightning down, it's going to hit somewhere."