Cleaning supplies are being blamed for an explosion in a Fredericton, N.B., apartment building Friday night. 

Police received several reports about the blast after 9:15 p.m. It happened on Woodstock Road in the city's south end.

Police canvassed the area and found "significant damage" inside a single unit. Nobody was hurt.

Sgt. Charlie Cameron said part of the building was evacuated and a bomb-disposal unit responded to the call, but residents have since been allowed to return.

Officials said a misuse of cleaning supplies likely caused the explosion. The unit was being cleaned so it could be rented and someone left commercial-grade cleaners inside a working fridge. When the supplies cooled down, they exploded.