According to Ryan Moran, a witness at the scene of the crash, he originally thought the noise he heard was from a toy plane that someone was flying.
"One of the planes crashed on the roof of one of the stores and the other one on the asphalt of the parking lot", said Nancy Colagiacomo, a spokeswoman for the police force that serves Montreal's south shore.
Twenty years ago four people died when two Cessnas, one privately owned and the second owned by Cargair, collided at the Mascouche Airport.
He was outside smoking a cigarette when he saw the plane crash.
A security perimeter was set up near the shopping centre yesterday. The shopping center was evacuated. He suffered serious injuries and is in hospital though police said the extent of his injuries is unclear.
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"We just want to reassure our populations that we've been here since the beginning of this situation and all the services are working onsite", said Martin Murray, the mayor of Saint-Bruno during a press conference on Friday afternoon.
Jonathan Vanasse was eating inside a mall restaurant next to the crash site.
"No one was panicking, but people started crying a few minutes later, when they realized a plane had fallen from the sky".
The Transportation Safety Board is now investigating the exact cause of the crash.
The two planes were Cessna 152 aircraft belonging to the nearby Cargair flight school, said Canada's transport safety authority, which has opened an investigation.