A fire blazing in the Great Smoky Mountains National Park was started by a motorcycle crash.

National Park Service spokesman Bob Miller said the fire had grown to about 10 acres by Wednesday night and would expand further Thursday while firefighters worked to contain it.

It began when a rider crashed his motorcycle on U.S. 129 in a winding area known as "the Dragon."

Miller said the steep and rocky terrain prevents firefighters from making a direct attack on the fire. They were working to contain it between the highway and the Topoco power line.

Officials said the motorcyclist walked away from the crash.