A new report by federal investigators looking into a fire and explosion near Hayward last month revealed that Alameda County Fire Department officials who were on scene to respond to the damaged gas line left at the suggestion of PG&E more than an hour and a half before the explosion erupted.
The National Transportation Safety Board’s preliminary report, released Thursday, is the clearest timeline of events on Dec. 11, which resulted in three destroyed buildings and six people being hospitalized. Investigators have not said what sparked the explosion.
The brief report recounts some details that officials had already disclosed. Just before 7:30 that morning, PG&E learned that construction workers had damaged one of their gas lines on the 800 block of Lewelling Boulevard in the unincorporated East Bay community of Ashland.



