INDIANAPOLIS - A chemical explosion Tuesday at a General Motors metal-stamping plant in Indiana killed a contractor and injured five other people, authorities said. The blast killed James L. Gibson, 48, Grant County Coroner Stephen Dorsey said. Marion General Hospital was treating five other people with non-life threatening injuries, hospital spokeswoman Ann Vermilion told the Marion Chronicle-Tribune. However, GM issued a statement saying four employees were under observation for non-life-threatening conditions at the hospital and that four others were transported there, but required no treatment. "The situation is contained. Everybody has been evacuated," GM spokeswoman Stephanie Jentgen said in a...