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ARLINGTON, Va. (AP) — Officials are investigating the failure of two electrical feeds and underground equipment after a power outage at Reagan National Airport outside Washington.

Dominion Energy Virginia spokesman Chuck Penn said Thursday that an underground equipment failure caused Wednesday night’s nearly 90-minute outage, but Dominion is still investigating why the equipment and two feeds failed. He says there’s no evidence of foul play.

Travelers tweeted eerie photos of dimly lit halls, people trying to find luggage at frozen carousels using cellphone flashlights and a worker handing out bags.

Metropolitan Washington Airports Authority spokesman Andrew Trull says backup generators powered critical functions and emergency lighting. Planes were able to take off and land, but he says passengers used air stairs and some workers hand-delivered baggage. Things returned to normal Thursday morning.