A gas explosion triggered a major fire in the unincorporated community of Ashland near Hayward on Thursday after an underground line was damaged by a construction crew, fire officials said. At least one home was destroyed, windows were blown out and nearby houses shook. Six people were taken to hospital for treatment, Alameda County Deputy Fire Chief Ryan Nishimoto said. Three were sent immediately with serious injuries and three others had more minor injuries, AP news agency reported. Three structures on two separate lots were severely damaged, Nishimoto said. Some of the 75 firefighters on the scene were forced to back off momentarily after feeling electric shocks from fallen power lines. The video, which came from doorbell camera footage, showed a large building engulfed in flame

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