Toronto Fire Services say they are dealing with a “complex fire” after two apartment buildings were forced to evacuate when crews discovered burning insulation and high levels of carbon monoxide.

Crews were first called to the highrise apartment building on 11 Thorncliffe Park Dr., on Thursday at around 1:30 p.m., where they found “light smoke” throughout multiple floors of the building. The fire then spread to another adjacent building on 21 Overlea Blvd.

Residents from 408 units in the two buildings affected were forced to evacuate.

“What we thought would have been a normal fire for us to put out has turned out to be one of the more complex fire situations we have had in a long time in this city,” said fire Chief Jim Jessop in an update to reporters on Friday morning.

Jessop said the

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