A naked woman who said she had been sexually assaulted stole a sheriff's vehicle on Thursday and led authorities on a long high-speed chase that ended in the middle of an Arizona highway, a sheriff's deputy said.

The woman, who authorities have not identified, was taken to a hospital after she was subdued by a "stun bag" when she left the sheriff's truck on a median along Interstate 10 in southern Arizona, Maricopa County Sheriff's Office Chief Deputy Ben Henry told reporters.

Sheriff's officials said the incident began on Thursday morning when a deputy was called to a gas station and encountered the naked woman standing outside, Henry said. The deputy said the woman appeared distraught and disoriented, Henry said.