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[$$] Gas Explosions Traced to Too Much Pressure in Pipes

BOSTON—The series of deadly gas explosions and fires in three communities north of Boston last week occurred after too much natural gas was pumped into a section of pipe owned by Columbia Gas, causing the combustible fuel to leak into homes, authorities said Sunday. The National Transportation Safety Board “can confirm at this time that this was indeed an overpressure situation,” NTSB Chairman Robert Sumwalt said at a news briefing. State and federal authorities are investigating after at least 60 fires and explosions traced to gas lines erupted Thursday in Lawrence, Andover and North Andover, about 25 miles north of Boston, killing an 18-year-old man and injuring multiple people.