SISSONVILLE, W.Va. (AP) — Four homes went up in flames and collapsed in charred heaps Tuesday after a natural gas line exploded in an inferno that raged for at least an hour, melting guardrails and pavement on a swath of Interstate 77. Five other homes had extensive external damage, and several people were treated for smoke inhalation, but authorities said there were no fatalities and all residents had been accounted for. "We've been very fortunate," said Gov.