A man is wanted by police investigating a suspected hit-and-run crash that seriously injured a 17-year-old cyclist.

Thames Valley Police said a motorcyclist failed to stop and left the scene following a collision on Banbury Road in Oxford shortly after 0815 GMT on Monday.

The cyclist suffered life-threatening injuries and remained in hospital in a serious but stable condition.

Police said they wanted to track down Nazım Kacem, 29, from Oxford, as he may have “vital information” about the case.

4 people have been arrested so far within the scope of the investigation.

A 14-year-old boy was released without charge, while three more people, a 50-year-old man, a 41-year-old man and a 37-year-old woman from Oxford, were released while investigations continued.

Inspector Justin Thomas said: “I would appeal to anyone who knows the whereabouts of Nazim Kacem to contact Thames Valley Police.

“We would like to speak to him urgently about this collision.

“I also directly appeal to Nazım and ask him to contact us if you see this call.

Mr Kacem is from Oxford but is also known to frequent Bristol and Crouch Hill in London.