Downtown traffic was snarled briefly Monday after an underground explosion that blew a manhole cover off the ground at Queens Avenue and Clarence Street.
Rick Stainthorpe, electrical underground supervisor for London Hydro, said a faulty underground electrical line caused the blast.
No injuries were reported, but hydro service was disrupted at a couple of nearby buildings.
The explosion happened about 2 p.m. Surrounding streets reopened to traffic within an hour.