Hitting the ground with enough force to bounce a worker off the ground, one of the nation's largest mobile cranes collapsed at a Houston oil refinery, killing four workers and injuring seven others, AP reported. Investigators for the Occupational Safety and Health Administration were at the site Saturday, officials of the refinery and the crane company said. Deep South Crane & Rigging, the Baton Rouge, Louisiana, company that owns the 300-foot-tall (91.44-meter-tall) equipment, plans to work with the federal investigators looking into what is the latest in a series of fatal accidents involving cranes around the country. «We will cooperate fully with all investigations that may arise from this tragic incident. We will provide information as we gather and verify it,» company spokeswoman Margaret Landry said in a statement.
