CCTV footage shown to jurors today shows the movements of three males accused of murdering Jourdan Griffiths, before and after the 20-year-old was stabbed, a court heard.

Lotto Williams, 19, Christopher Joseph, 22, and a 17-year-old who cannot be named for legal reasons, each deny murder.

Police investigator Karen Brooker told Reading Crown Court she identified the defendants from footage taken in High Wycombe on June 29 last year.

She identified Joseph riding a bicycle, Williams pushing a bicycle and the 17-year-old walking with them. The footage was taken from cameras at the Swan car park, McDonald's, Eden shopping centre and Cheltenham & Gloucester building society among others.

Mr Griffiths died from a single stab wound after an 'attack' at a squat on White Hart Street, just after 11pm that night.

The images show the defendants do not have their hoods up shortly before 11pm, but several minutes later they move down White Hart Street with their hoods up, towards an alleyway that leads to the squat, she said.

About six minutes later the 17-year-old runs up White Hart Street from the alleyway with only one white trainer on, she said. He was followed by Williams and then Joseph on bikes, jurors heard.

They were then seen on Parker Knoll Way, when the 17-year-old is wearing a different, lighter top, and riding on the back off Williams bike, she said.

The next clip showed the three on Frogmoor, with Williams now on foot, she said. The 17-year-old looks over his shoulder and then runs down Dovecot Road, the court heard.

He is not seen again but Joseph and Williams move on to Oxford Road and head towards Bridge Street, she said.

Joseph and Williams were arrested on Desborough Road at about 11.30pm. The 17-year-old was arrested a few days later.

Mrs Brooker agreed there could be 'distortions' of light in the images, but the defence lawyers did not dispute that it was their clients in the footage.

The trial continues.