A murder investigation has been launched after a young man was knocked down by a car in a city centre.

Alex Jeffery died after being hit by the vehicle in Cambridge city centre.

The 21-year-old, from Melbourn, near Cambridge, was taken by ambulance to Addenbrooke's Hospital with serious injuries on 1 November. He died in hospital on Saturday, 8 November as a result of his injuries.

Police said the incident followed an "altercation in the street". The attack happened outside the Cambridge City Hotel, on Downing Street, near the junction with Corn Exchange Street in Cambridge.

Detective Chief Inspector Jerome Kent said: "I believe there are still people out there who witnessed this incident but still haven't been in touch with police and I would urge those people to pick up the phone and call in.

"In particular I am keen to speak to the two security guards who came to Alex's aid. I would also urge anyone who may have been travelling in the car involved in this incident or knows who the driver is to come forward.

"We are viewing CCTV from the area so it is only a matter of time before they are identified. This is a devastating and traumatic time for the family and is it vital we catch the person responsible."

A post mortem examination will take place later this week.

His family released a statement: "Alex was a fun loving, kind and caring son, grandson and brother. He is so missed by us all."

Anyone with information should contact the Force's Major Crime Unit on 101 or Crimestoppers, anonymously, on 0800 555 111.