Police are appealing for information after a teenager was allegedly assaulted by a group of men and had his motorcycle stolen in Londonderry.

Emergency services were called to Devlin Road about 5pm on Sunday, January 26, following reports a 17-year-old boy had been struck by a Triton utility while riding with another teen and a 25-year-old man.

Police said the boy was then allegedly set upon by up to ten men not known to him, before his motorcycle was stolen. He was taken to Hawkesbury Hospital for treatment.

A short time later, officers from Hawkesbury Police Area Command were flagged down by the two other riders and informed of the incident. A crime scene was established and examined by the Crash Investigation Unit.

Police are now seeking assistance to identify the occupants of a red Holden Barina seen at the scene.

An image of the vehicle has been released on NSW Police Force social media sites.

Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or via nsw.crimestoppers.com.au. Information is confidential, and police remind the public not to report through social media.

Police are seeking witnesses and have released an image of a red Holden Barina seen at the scene.