An anonymous bomb threat forced the evacuation of 2099 Pennsylvania Ave. and the neighboring Hotel Lombardy at 3:30 p.m. this afternoon, according to a D.C. official.

Police blocked off the eastbound right lane of Pennsylvania Avenue and the 800 block of 20th Street while bomb-sniffing dogs searched the 10-story office building. The all clear was given at 5:15 p.m.

Charles and Peggy Phillipa, tourists staying at the Hotel Lombardy, said the bomb threat was a minor inconvenience.

“We were coming back to the hotel and our feet are tired from our day,” Mr. Phillipa said. “Whoever did this inconvenienced a lot of people.”

Officials are currently investigating the source of the call.