A small plane - possibly carrying children on a ski trip - crashed Sunday as it approached the Butte airport, killing 14 to 17 people aboard, a federal official said. The single engine turboprop nose-dived into a cemetery 150 meters from its destination. The aircraft crashed and burned while attempting to land, said Federal Aviation Administration spokesman Mike Fergus. The plane crashed in Holy Cross Cemetery. An investigator with the National Transportation Safety Board offered few details at a press conference in Butte Sunday night. No cause of the crash was given. "We are just beginning our investigation," said Kristi Dunks. "We don't have a lot of information at this time. "Certain family members were contacted," she said. "At this point, I don't have an exact number."