An issue at a Pepco substation left tens of thousands of Washington, D.C. residents without power Saturday afternoon.

Pepco confirmed the outage on its social media accounts Saturday, explaining that about 39,000 people were affected. Deputy Mayor Kevin Donahue (D) tweeted that the number was closer to 40,000.

.@PepcoConnect reports outage reduced from 40,000 customers without power down to 33,000 customers. Power restoration will take a few hours. Outage is due to issue at Florida Ave substation.



Restoration updates here: https://t.co/IISGA0afsk — Deputy Mayor Donahue (@SafeDC) July 27, 2019

"An issue at Pepco’s Florida Avenue substation has impacted service to approximately 39,000 customers in the District of Columbia. We are working to restore service to customers as quickly and safely as possible and are investigating the cause of this incident," Pepco tweeted.

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We appreciate the patience and understanding of our customers as we work to restore their service. If you are currently experiencing an outage please call our outage number at 1-877-737-2662. For the latest on estimated restoration times, please visit: https://t.co/3gPxtJWA6R — Pepco (@PepcoConnect) July 27, 2019

Officials told NBC 4 Washington that power was out at two city hospitals, Washington Hospital Center and Howard University Hospital, while D.C. fire officials reportedly were responding to a large number of emergency calls, including several stuck elevators. No injuries were initially reported due to the blackout.

The issue also reportedly affected the Adams Morgan, Shaw, and Mt. Pleasant neighborhoods, as well as other areas in Wards 1, 2, and 3 of the city.