Update at 3:45 p.m. — Dominion reports that the cause of the outage was an underground equipment failure and power has been restored to all customers.

Dominion crews are at the scene of a power outage that has left part of Ballston dark.

Dominion Power spokeswoman Le-Ha Anderson confirms that around 250 customers are affected by the outage. Numerous ARLnow.com readers in the 4200 and 4300 blocks of N. Fairfax Drive report being without power since about 1:15 p.m.

Drivers and pedestrians should also be aware that the traffic light is out at the intersection of N. Fairfax Drive and N. Taylor Street.

A number of Dominion workers, apparently investigating and attempting to fix the problem, have been spotted along N. Utah Street near Fairfax Drive. So far, there is no confirmation of exactly what caused the outage or when customers should have power again.