STAMFORD - More than 100 Stamford residents were left in the dark Saturday after an underground explosion caused their apartment building to lose power.

Firefighters say a transformer exploded underground at 58 West North St. around 11 a.m. Authorities blocked off the area while the problem was attended to.

According to Stamford Fire Chief William Smith, the power company pulled the building's fuses. That allowed firefighters to go down into the vault and tend to the explosion.

No one was injured in the explosion, firefighters say. However, they say a resident did have to be rescued after getting trapped in an elevator.