A gas explosion in the Ashland area near Hayward, California, caused severe damage and injured six people after a construction crew allegedly struck an underground PG&E line.The blast obliterated at least one home, severely damaging three structures, and prompted a large emergency response as investigations began.The
Alameda Sheriff's Office,
PG&E, and
NTSB are now investigating the incident, which was captured on dramatic video footage, to determine its full cause.