Cause of northeast-side blast still not known

COLUMBUS, Ohio (WTVN) -- An investigation is underway into the cause of an explosion at a northeast Columbus apartment building.

Firefighters were called to Edge of Village Sunday near Blendon Woods Metro Park when the blast rocked the building.

Three people were hospitalized with injuries suffered in the explosion.

The building sustained structural damage and is not safe for residents.

(NBC NewsRadio contributed to this story.)

(Photo courtesy ABC6/FOX28.)