Manhole cover blown off in SW Phila.

July 26, 2012 2:33:01 PM PDT
Investigators say they have figured out why a manhole cover blew off on a street in Southwest Philadelphia

Firefighters say an underground transformer blew, creating an explosion that lifted the manhole cover.

The cause of the transformer explosion is still under investigation.

The incident happened shortly before 12:00 p.m. at the intersection of 51st and Baltimore.

No injuries were reported.