The explosion happened about 1:05 a.m. in Otterburne, Manitoba, about 50 miles south of Winnipeg, the Canadian Broadcasting Corp. said. Residents in the area reported hearing a "loud explosion" followed by a flash of orange flames stretching into the air.
"It lit up the whole sky here for half an hour. The sky's still glowing, actually," Tyler Holigroski told the CBC.
The pipeline is owned by TransCanada Pipeline. The company said it is investigating the cause of the blast and has temporarily shut down the line.
No injuries were reported.
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