Blast 'a surprise': Canadian Natural

The head of operations at Canadian Natural Resources' Horizon oilsands mine north of Fort McMurray said the upgrader explosion and fire Thursday that injured five staff came as a complete surprise.
Senior vice-president Peter Janson said there had been repairs completed just before Christmas, but they are not believed to be related to the blast that ignited a stream of gaseous bitumen feeding into the upgrader's four coker drums.
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Source: Calgary Herald