By Daniel Trotta (Reuters) – Four people including the pilot died and another person was critically injured when their hot air balloon crashed into the Arizona desert on Sunday after eight skydivers had successfully jumped out of the basket, investigators said. The Kubicek BB 85 Z balloon went down on Sunday in Eloy, about 65 miles (100 km) southeast of Phoenix, the U.S. National Transportation Safety Board said in a statement on Monday. The cause remained under investigation. “The balloon impacted desert terrain following an unspecified problem with its envelope,” the NTSB said, referring to …