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Now in its 18th year, the event is a highlight in the social and economic calendar.
Five people are dead and dozens injured, some with 'catastrophic' injuries.
"We saw a lot of police and ambulances," said Juliet Brine.
The British Prime Minister called the attack in which four people died as being 'sick and depraved'.
Yan St-Pierre says terror groups often factor in important dates while planning attacks.
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