The crash investigators will also be looking for “perishable evidence” from the scene, Sumwalt said. Warning about potential high-fatality accidents, safety investigators recommended two years ago that the Federal Aviation Administration impose greater oversight on commercial hot-air balloon operators, government documents show. “We look at three things, the human, the machine and the environment,” Sumwalt said. NEWSLETTER: Get the day's top headlines from Times Editor Davan Maharaj >>Asked whether the atmospheric conditions could have contributed to the crash, he said investigators were assessing that possibility. The NTSB will be looking for cellphone videos from those inside the balloon when it crashed and caught fire early Saturday morning, NTSB member Robert Sumwalt said at a news conference in Washington on Sunday morning.

Source: Los Angeles Times July 31, 2016 18:37 UTC