For Metro/Mila Petkovic London Hydro workers are pictured Monday at Queens Avenue and Clarence Street, the scene of an underground explosion.

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.

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