Explosion led to three-alarm blaze in Hayward, California, neighborhood after construction crew damaged a gas pipeA big explosion erupted in a San Francisco Bay Area neighborhood of Hayward, California, after a gas line rupture on Thursday, injuring at least six people, according to local news repor ts.The explosion broke out around 9.30am local time, several hours after a construction crew damaged a gas pipe. At least eight fire engines and two fire trucks responded to the three-alarm blaze. Continue reading... ...read more read less