Firefighters in Stony Plain, Alta., are still looking for the cause of a fire that destroyed a 36-unit apartment building Thursday night.

Mayor William Choy believes the fire is one of the largest ever seen in the community west of Edmonton.

He saw the fire while on a bike ride with two of his children.

He's now worried for the 64 people left homeless.

"There's lots of families, a lot of foreign workers and landed immigrants," he said. "There's a lot of stories of people not having tenant insurance."

Amie and Joel Outen, who were insured, turned up at the burned-out apartment building this morning looking for their two cats.

"They're okay," said Amie. "We worried about them all night. They were hiding in behind pieces of the roof that collapsed."

The Edmonton Emergency Relief Services Society and Spruce Grove Supercentre Walmart are accepting donations of small appliances, bedding, furniture, toys and clothing, he said.

The Red Cross Personal Disaster Assistance Team is also on hand and will be providing emergency assistance to those affected for 72 hours.

The fire, which began around 6:45 p.m., is believed to have started on an upper floor.

With files from CBC's Lydia Neufeld