CTV Ottawa fire origin unknown: report

The cause of the fire that destroyed CTV's Ottawa newsroom studio in February remains a mystery after Ontario's Office of the Fire Marshal was unable to determine a cause.

The cause of the fire that destroyed CTV's Ottawa newsroom studio in February remains a mystery after Ontario's Office of the Fire Marshal was unable to determine a cause.

The investigation into the blaze at the studios at 1500 Merivale Rd. wrapped up on Monday, with the fire marshal's office saying the extent of the damage to the building made it difficult to track the fire to its origin.

The fire started sometime before 4:30 a.m. ET on Feb. 7 and tore through the newsroom for CTV Ottawa, formerly known as CJOH-TV, on the second floor of the building in the southern suburb of Nepean.

It took 70 firefighters and 18 fire trucks more than two hours to bring the fire under control. The fire caused an estimated $2.5 million in damages.

CTV is now operating out of the Byward Market.