Five people were killed after a tourist helicopter crashed near the Smoky Mountains in east Tennessee on Monday, officials said. The Bell 206 sightseeing helicopter was destroyed by fire, according to Federal Aviation Administration spokeswoman Kathleen Bergen. It’s unclear what caused the helicopter to crash, but Pigeon Forge Police Department Chief Jack Baldwin said it was one of the worst crashes he’s ever seen. No homes were damaged and no one on the ground was hurt. National Transportation Safety Board investigators were at the scene, a spokesman said.