MN – Star Tribune – Three families were left homeless after a vacant townhouse unit connected to their residences blew up late Sunday night in Fridley.

Five people were taken to Unity Hospital and North Memorial Hospital in Robbinsdale with minor injuries due to the explosion, according to an Anoka County sheriff’s office spokesperson. The explosion occurred about 11 p.m. in the 1600 block of 68th Avenue.

Firefighters said a preliminary investigation revealed that a natural gas leak may have caused the explosion, according to KSTP-TV. No one was living in the unit that exploded.

Although only one townhouse unit blew up, the explosion was so strong that residents in surrounding units said that they could feel it. A gaping hole exists where the second floor once stood. The damaged unit was split in two as the roof appears to have collapsed into the vacant unit.

This morning, authorities roped off the debris-strewn area as CenterPoint Energy crews and fire marshall officials investigate.