A gas explosion in the Ashland area near Hayward, California, severely damaged buildings and sent six people to the hospital after a construction crew struck a PG&E underground gas line.The blast, which occurred hours after the initial damage report, obliterated at least one home and severely impacted three other structures, prompting a large emergency response.The
Alameda Sheriff's Office and
NTSB are now investigating the incident, with
PG&E also involved, to determine its full cause.