Updated at 6:09 p.m.

Connecticut Avenue NW is open again after closing down due to a manhole explosion, according to tweets from the D.C. Department of Transportation.

In the Cleveland Park neighborhood, 570 Pepco customers are still without power because of the explosion.

D.C. Fire and Emergency Services spokesman Tim Wilson said that the cover blew off of the manhole between Cathedral Avenue and Macomb Street shortly after 4:30 p.m. Wilson said that he did not know what caused the underground explosion, and nothing inside the manhole was burning.

The fire department determined that the manhole was supervised by Pepco. Pepco spokesman Marcus Beal said that Pepco crews were en route to the site  about 6 p.m. One Pepco feeder was affected by the explosion, Beal said. Of roughly 1,500 to 2,000 customers in the neighborhood served by the feeder, 570 had lost power.