UPDATE, 2:15 p.m.: Authorities reported a second motorcycle crash in the area of Angeles Crest Highway, Sunday afternoon.
The second crash was reported on the right shoulder of the mountain road near Upper Big Tujunga Canyon Road, in the same area as the first reported crash, according to CHP officer Monica Posada.
The most recent reports indicate the second crash victim received major injuries in the solo motorcycle crash, first reported around 12:30 p.m. The crash victim was transported to Huntington Memorial Hospital.
Both incidents were reported by the US Forestry Service, authorities said.
No further details were immediately known about the first crash earlier Sunday.
Previously: Authorities are still on scene of a motorcycle accident on Angeles Crest Highway past Upper Big Tujunga Canyon Road, Sunday morning.
The crash was first reported to authorities before 11 a.m. near mile marker 42, well above the community of Sierra Madre.
The motorcycle was reportedly 50 feet over the side of the road, said Monica Posada of the California Highway Patrol. It is unknown if the motorcyclist was helped to the road by responding emergency personnel, passersby or under the riders own power.
According to scanner reports, Air Rescue 5 from the Los Angeles County Sheriff's Department called off emergency ground units and tended to the victim. It was unknown where the victim was flown to, or if there were more than one person injured.
This story will continue to be updated as information becomes available.