A federal investigator says there's no evidence to suggest the gas explosions that rocked communities north of Boston were intentional. National Transportation Safety Board Chairman Robert Sumwalt said Saturday as federal officials opened their investigation into Thursday's disaster that there doesn't appeal to be "anything nefarious, anything suspicious, anything intentional." Sumwalt said it appears Columbia Gas' pipeline control centre in Columbus, Ohio, registered a pressure increase in the Lawrence area. He said investigators will be working to develop a timeline, including how local utility officials reacted to the pressure increase. Watch: Natural gas explosions displace thousands in Boston suburbs

Source: CBC News September 15, 2018 21:33 UTC