Northern Territory Police are calling for witnesses following an assault in Alice Springs overnight.

At around 8pm, a 30-year-old female passenger has jumped out of a moving vehicle before the male driver has pulled over and allegedly assaulted her.

A woman travelling in the vicinity has witnessed the incident and intervened. The woman has assisted the female victim before taking her to Alice Springs Hospital.

Police would like in particular to speak with this woman.

The incident is believed to have occurred on the side of the Stuart Highway, south of Alice Springs near the cemetery.

Anyone who has information which may assist with investigations, is urged to contact Police on 131 444 or report it anonymously via Crime Stoppers on 1800 333 000. Please quote reference number 9514265.

Police urge the community to report all incidents of, or concerns about domestic violence. These reports are treated with the utmost seriousness.