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Gas blast at Conn. power plant kills at least 5 (AP)

The Kleen Energy plant is seen in this aerial photo after an explosion in Middletown, Conn., Sunday, Feb. 7, 2010. (AP Photo/Jessica Hill)AP - An explosion that sounded like a sonic boom blew out walls of an unfinished power plant and set off a fire during a test of natural gas lines Sunday, killing at least five workers and injuring a dozen or more.