The White House, State Department, and Capitol were all affected by reports of widespread power outages across Washington and its suburbs Tuesday afternoon.

The utility company Pepco said it was investigating the outage reports. Spokesman Sean Kelly said he did not have details about locations or how many customers were affected.

Some outages were brief. Electricity in the White House press briefing room dipped around lunchtime, darkening cubicles and blackening TV screens, but service resumed within seconds.

Power went out at the State Department during the daily press briefing, forcing a spokeswoman to finish comments in the dark.

Metro tweeted that several stations were on backup power.

University of Maryland officials say their entire campus was affected.

The Smithsonian tweeted that the outage was affecting some of its museums, and they were evacuated.

Weather in the area was overcast, but there were no storms.