Videos shared online show members of the crowd throwing drinks at the stage before a scuffle breaks out.
When officers arrived to investigate, Hopkinson said police identified about five people who had been injured during the melee. An update this morning notes that one man is now in "life-threatening condition after he was stabbed" during the concert. His friends took him to hospital and he underwent surgery overnight.
"We have our detectives that are poring over videos and testimonies from witnesses".
But several performers were attacked onstage "by a number of people", according to the Toronto Police Department.
The sold-out show featured Phony Ppl and Bernard Jabs alongside Pusha T.
Pusha and Drake have been feuding for the better part of the a year ago, only coming to a seeming close with Pusha's "The Story of Adidon", in which he revealed Drake has a secret child.
Drake was quick to respond this time and released "Duppy Freestyle", where, in the midst of all his disses, he mentions Virginia Williams, Pusha's longtime girlfriend. "Pusha T ran scared for his life even when surrounded by an army of security this man is no gangster so don't ever come to Toronto and disrespect the 6 God", another fan added.
So far, no one has been arrested in connection with the brawl.