An active fire at two Toronto apartment buildings is being called one of the “most complex” situations in the city’s history, said fire Chief Jim Jessop.

Crews are still on scene, with over 77 firetrucks rotating shifts overnight, after a fire was discovered Thursday afternoon at 11 Thorncliffe Park Dr. and 21 Overlea Blvd., said Jessop at a news conference Friday morning.

He said insulation was slowly burning in the walls and between the two buildings, which has led to smoke and high levels of carbon monoxide.

“This is going to be a prolonged event … every time we thought we had it under control, it came back up,” said Jessop, adding residents of both buildings have been evacuated.

“This is certainly probably the most challenging fire to extinguish that Toronto has seen in years."

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