COLUMBUS, Ohio (WTVN) -- Power has been restored after several hours after a fire and at least three explosions in downtown Columbus early Friday. The incident sent manhole covers into the air, at least one crashed through windows at the Chase Bank office building.

The issue was traced to a problem in an underground power equipment vault.

There were no reports of any injuries.

AEP spokeswoman Terri Flora says what caused the malfunction hasn't been determined yet. Crews working on repairs had to cut power to areas of downtown, affecting a number of office buildings.

AEP's own headquarters at 1 Riverside Plaza was without power during the outage. As a result, employees were told not to report for work Friday.

The Franklin Board of Elections closed for the day due to the power outage as well as the Ohio Attorney General's office at 150 E. Gay Street and the Ohio Secretary of State's office.

Ohio Health's offices at 180 E. Broad St. were without power.  Employees were asked to either work from home or report to another Ohio Health location.  

The Social Security Administration's office in the John Bricker Federal Building at 200 N. High St. is closed.

Southeast Inc.'s offices at 16 W. Long St. are closed.

Click here for photos from our news partners ABC6.

(Photo courtesy ABC6)