The cause of a Spring Garden Township fire that displaced two families Sunday afternoon is still being investigated.

The fire at a duplex in the 600 block of Ridge Avenue affected 10 residents, including six children.

Firefighters were dispatched at 2:16 p.m. Sunday and cleared the scene around 3:30 p.m., said John Woods, battalion chief for York Area United Fire and Rescue.

It took just 15 minutes to get the fire under control, but firefighters spent an hour opening up the walls in the home to make sure the fire was completely out, he said.

The blaze started on the second floor, Woods said.

A state fire marshal has determined the incident to be accidental and continues to investigate the cause, Woods said.

Cindy Donahoue was one of the homeowners. Her next-door neighbors moved in Saturday, she said.

Donahoue's children were upstairs in their bedroom when they began to smell smoke and ran downstairs, she said.

"All their toys ... all their stuff," she trailed off, shaking her head and pursing her lips. Her two cats were still inside, kept downstairs and away from the contained fire.

When Donahoue first smelled smoke, she thought something was burning outside. The fire never did flame, she said.

The York Area United Fire and Rescue, Manchester, Union Fire Co., North York, York City, York Township and Wrightsville fire departments responded to the scene.

Woods estimated the damage to be about $75,000.

-Reach Mollie Durkin at mdurkin@yorkdispatch.com.