Malton Fire Injures Firefighters.

A powerful explosion at a Mississauga warehouse came without warning on Wednesday morning, injuring a group of firefighters who were trying to make their way inside.
It was just after 4:30 a.m. ET when firefighters were alerted to the fire at an industrial warehouse located at 2797 Thamesgate Dr., just north of Toronto Pearson International Airport.

As the first firefighters on the scene attempted to enter the building, a large explosion caused a wall to collapse, briefly trapping them inside.

http://www.cbc.ca/news/canada/toronto/explosion-at-mississauga-warehouse-injures-4-firefighters-1.2618753