Demolition crews are at a home in northwest Calgary after a fire Friday that damaged two other homes — but so far, the cause of the blaze is still a mystery. 

It started at the home on Evansmeade Crescent N.W. and quickly spread, but no one was injured. Now, it seems at least one of the homes will be torn down due to the damage.

"The insurance company is on scene right now and I believe they are taking the source building down because of the amount of damage," said Battalion Chief Alan Ball with the Calgary Fire Department. "It was obviously a write-off. There were some portions of walls that were still standing so they have a demolition company in there right now."

Ball says a second home may also be coming down because of damage.

As well, investigators are trying to determine the cause of a fire at a northeast bridal shop.

It happened in the 100 block of 16 Avenue N.E. just after midnight and caused significant damage.

Crews were able to stop the fire from spreading to other businesses but currently don't know why it started.