ANGELES NATIONAL FOREST — Authorities shut down both lanes of Angeles Crest Highway north of La Canada Flintridge Sunday after a motorcycle crash.

The crash was reported about 10:30 a.m. at mile marker 37.6 of Angeles Crest Highway, Los Angeles County sheriff’s Lt. Angela Shepherd said.

The California Highway Patrol issued a Sig Alert for both directions of the road, which was lifted about an hour later.

Initially reported as a motorcycle over the side, the crash involved the motorcycle and one other vehicle, CHP officials said. The motorcyclist was flown to a hospital by helicopter as a precaution, though the injuries were not believed to be severe.

Further details on the crash were not available Sunday afternoon.