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A series of explosions and fires, believed to have involved at least one natural gas leak, tore through the Boston suburbs of Lawrence, Andover and North Andover late Thursday afternoon. Initial, unconfirmed, reports stated that an “overpressure” situation with a gas line may have started a chain reaction of explosions and subsequent fires. In an overpressure accident one gas line will rupture, usually after being damaged during earlier construction work. Once that rupture occurs, automatic safety valves will shut down…