A fire at an industrial building in central Kitchener is now considered suspicious, fire officials say.

Madison Ave fire

Firefighters were called to the property on Madison Avenue South near Courtland Avenue around 4 p.m. Tuesday.

The building was not an active factory, but was being used for storage.

Madison Avenue fire

The Kitchener Fire Department says there were signs of a break-in, as well as evidence of small fires being set inside the building.

Fire officials and Waterloo Regional Police are investigating.