West Virginia reopened Interstate 77 on Wednesday, one day after a massive gas explosion turned 800 feet of asphalt into cinder and leveled four homes along the road and damaging another five. There were no deaths reported. Federal and state employees are still investigating the cause of the explosion that occurred in a gas transmission line owned by NiSource Inc., parent company of Columbia Gas. “It really cooked the interstate,” said Kent Carper, president of Kanawha County Commission. The explosion melted guardrails, cooked the green enamel off highway signs, and burned utility poles along the road.