A woman has been jailed for sexually assaulting a taxi driver while an accomplice allegedly held a knife to his throat.

Brittany Carter, 24, assaulted the driver in a moving car before stealing $32 (£25) from him, and police say they "don't know why she did it".

Originally charged with rape, Carter, of Fremont, Ohio, pleaded guilty to the lesser charge of "gross sexual imposition" as well as robbery.

She was jailed for a total of four years, and must register as a sex offender for 15 years, IB Times reported.

In January, Carter and the alleged accomplice, who is due to face trial later this year, ordered a Trinity Express Cab Service car to pick them up.

While in transit the accomplice, a 20-year-old man, is said to have put a knife to the throat of the 29-year-old driver while Carter performed oral sex on him, it was reported.