Officials said some of the gunshot wounds were life-threatening injuries, the Canadian Broadcasting Corp. reported Thursday.
A spokesman for a British Columbia ambulance service told the CBC the shooting occurred Wednesday evening during a meeting of the International Longshore and Warehouse Union Canada at Riverside Banquet Hall.
Police said it did not appear the shooting -- which occurred as about 100 people were gathered in the banquet hall for an induction ceremony -- was gang-related.
The identities of the victims were not reported.
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