A man has been sent to hospital with serious injuries after firefighters found him collapsed in a burning basement early Sunday.

Just before 5:30 a.m., fire crews received word of a man trapped in a basement apartment fire on Cloverdale Avenue.

Firefighters forced their way inside the apartment and found the man collapsed by a set of stairs.

Paramedics transported the man to Hamilton General Hospital in serious condition. "But he is expected to survive," said Staff Sgt. Jack Langhorn.

Firefighters aren't yet sure what caused the fire, which resulted in heavy smoke conditions.

"From what I saw, it was confined mostly to the basement," said fire official Dave Christopher.

The Ontario Fire Marshal has been called in because of the serious injury to the resident. Officials did not yet have a dollar figure for the damage the fire caused.