CALGARY - The Calgary fire department says a plumber accidentally caused an explosion that ripped through a southwest Calgary home.
A spokesman says the blast happened Wednesday morning when the contractor mistakenly drilled through a riser that carries the gas inside the building.
A woman and her 15-year-old son inside the duplex suffered minor injuries when the blast tore off an exterior wall, sending glass, wood and debris flying.
The plumber - a man in his 30s - also suffered minor cuts and bruises.
A city engineer who has inspected the building says one side of the duplex is structurally unstable and may have to be torn down.
The fire department is urging anyone doing work near natural gas appliances or facilities to exercise caution and take the necessary steps to proceed safely.
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