One of the stuffed animals that covers the wall of the Tune Inn bar, which has been in operation since 1947. (Jay Paul for The Washington Post)

Crews were called to the scene in the 300 block of Pennsylvania Avenue SE about 7:15 a.m., said Pete Piringer, a department spokesman.

The blaze started in the kitchen and spread to duct work above before firefighters could contain it, Piringer said. Employees were working in the restaurant when the blaze started, but all were able to evacuate safely, according to Piringer.

The fire caused about $75,000 to $100,000 worth of damage, Piringer said. The cause of the blaze is still under investigation, but Piringer said it appeared accidental.

There was some smoke damage to memorabilia hanging on the walls of the restaurant, but the bar area escaped extensive damage, said Lisa Nardelli, the Tune Inn’s owner. Nardelli said the restaurant was opened by her grandfather in 1947.

She was unsure when the restaurant would reopen.

“We’ll do our best to get it up running again as soon as possible,” Nardelli said.