A man is still in hospital in a critical condition after a city centre crash on Friday.

The collision between a white lorry and a motorbike took place on Holywell Hill at 7.10am on Friday, January 10.

Shops and offices were closed until the afternoon while many police officers and paramedics dealt with the scene.

The motorcyclist sustained serious injuries, and was taken by air ambulance to the Royal London Hospital.

Sgt Simon Cooper, from the Bedfordshire, Cambridgeshire and Hertfordshire Road Policing Unit, said: "We are appealing for anyone who witnessed the collision to come forward as a matter of urgency.

"This is a busy stretch of road, and we believe that multiple people would have seen the incident occur or driven past soon after."

"If you did witness the incident, or have any information that you think could assist our investigation, please get in contact with us as soon as possible.

"I'd also ask anyone who was driving in the area around the time and has a dash cam fitted to their vehicle to please review their footage."

Anyone with information is asked to call police on 101 or go to herts.police.uk/report.