By Shannon Young syoung@repub.com U.S. Sens. Ed Markey and Elizabeth Warren this week pledged to get to the bottom of what caused a series of gas explosions in Lawrence, Andover and North Andover last month, arguing that the NTSB’s new preliminary report on the deadly incident raises more questions than it answers. The Massachusetts Democrats offered that while the … Continue reading Springfield Republican: Ed Markey, Elizabeth Warren say NTSB report confirms Columbia Gas ‘woefully unprepared’ for disaster, gas explosions may have been prevented