TORONTO - Toronto police who attended the scene of a mass shooting that left 12 people injured, half of them seriously wounded, say they were "horrified" by the violence at a pub in the city's east end.

Initial investigation shows three masked men entered Piper Arms at 520 Progress Ave. at 10:39 p.m. where people were celebrating the opening night of the pub, and sprayed the place with bullets, said Supt. Paul MacIntyre of Organized Crime Enforcement on Friday night.

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