Investigators say they have located four sets of human remains in the site of a tanker-truck manufacturer that exploded in Ottawa on Thursday, but have not yet been able to recover the bodies.
The remains of four people have been found at the site of a large explosion and fire in Ottawa, but the area remains too dangerous to recover them at this time.
The explosion at Eastway Tank Pump and Meter Ltd site on Merivale Road, Ottawa, is said to be the worst industrial accident in the city in more than half a century.
While it will likely be some time before there's a firm explanation as to what caused Thursday's fatal explosion, here's what we know so far and when we learned it.