A teenager has been killed in a crash on a Hampshire motocross track.

Bradley Hooper, 16, was severely injured when he was struck by another motorbike at the course at Headbourne Worthy near Winchester.

It came during a practice session on the course at around 10.10am yesterday.

The police immediately launched an investigation into how Bradley, from Farnham in Surrey, died.

The boy was with around 200 other riders booked in for a day's racing organised by the Portsmouth Motocross Club. He was taking part in a practice session to familiarise riders with the course.

An air ambulance took Bradely to hospital but medical staff were unable to save him.

The second rider a 15-year old boy, also from Farnham, suffered serious but not life-threatening injuries. He is currently being treated at hospital.

Bradley's next of kin have been informed.

Ashley Swaine, track manager, said today: “This is the first time anything like this has ever happened.

“Being the track builder it has taken its toll on me quite badly. There was no fault on the track but it is quite tragic. This is our first fatality and it hits hard.”

Mr Swaine said the company director Tony Child was liaising closely with the police.

A Facebook tribute page has been set up and already has more than 8,400 likes.

Steve Dixon from Bike It Yamaha, who organises the British Grand Preix at Matterley estate near Winchester, said: “Such a tragedy and a huge loss for all the family of Brad, our condolences.”

He said he will organise a tribute at the forthcoming British GP.

Roy Arnold said: “Although motocross is dangerous it's still a shock when we lose someone from the sport. My thoughts go out to his family and friends. Hope he's doing what he loves in heaven. R.I.P”

Fellow motocross racer Michael Young said: “Tear it up in those heavenly clouds, I'll be joining you some day, keep it roosting.”

Bex McFly Hunt said: “Although it is sad that we have lost such an amazing person, we will never forget him, he was absolutely amazing and heaven is lucky to have gained such a lovely person, Brad Hooper keep on shining.”

Kim Milbourne said: “When you hear of the death of a young rider, doing a sport loved by many, even when you don't know them it is heartbreaking. My thoughts are with his family and all who knew him.”

The Central Hampshire Coroner has been informed and a post-mortem was due to be held.

The 40-acre track, at Down Farm next to the A34, is around ten years old and has been operated by Tonymoto, based in Eastleigh.

Anyone who witnessed the incident, or captured footage of the incident or the bikes prior to the incident, is asked to contact Sergeant Andy Lynch at Eastleigh police station by calling 101 and quoting Operation Alkanet.