OTTAWA—CTV says its newsroom in Ottawa has been destroyed by a major fire.

It says the blaze ripped through the newsroom early Sunday, causing more than $2.5 million in damage.

The network says in a story published on its website that flames began on the second floor of the Merivale Road building sometime before 4:30 a.m.

CTV said it took 70 firefighters and 18 fire trucks more than two hours to bring flames under control.

It said an overnight security guard was working when the blaze broke out.

He suffered no injuries. The cause of the fire is unknown.