The helicopter landed on Route 17 near Mount Blair, said Deputy Director Sonia Porter. The highlands in the southern part of the state are known as Kelly Hollow. Mrs Porter was unsure what might have caused the crash. “At the time of the accident, I think the weather was clear,” he said. The plane was a Bell UH-1B helicopter, said the Federal Aviation Administration, which will investigate the crash with the National Transportation Safety Council. The Logan County Committee expressed its condolences to the families and friends of the victims on local television. “Our prayers are with them,” said Diana Barnett, the county commissioner. This is a story that unfolds. Jason M. Bailey contributed to the petition.