An expert in facial mapping was due to give evidence today in the trial of a 22-year-old man accused of hurling two petrol bombs at police lines during the Bradford riots.

The trial, the first for riot to be heard at the city's crown court, was adjourned early yesterday after the jury had watched police video footage of rioting and heard from officers, who all said they recognised Amjid Rashid.

Rashid, of Upper Woodlands Road, Girlington, was arrested in September after officers investigating last July's disturbances received information from colleagues who claimed to recognise his photograph among a group published in the press.

The jury were shown two short clips of video which showed an Asian man wearing a black jacket throwing two petrol bombs at police lines in the space of a minute.

The man, who the prosecution allege is Rashid, could also be seen jumping in the air in celebration after the missiles were thrown.

Rashid has pleaded not guilty to the charge of riot and the jury heard that in his interviews with police officers he disputed the man shown in the video was him.

He pointed out that the man was bulkier than him and also suggested that he had bigger ears.

Rashid stated that he did not have a moustache at the time of the incident last year.

The jury heard yesterday from various officers who had worked in the area where Rashid lived and had also seen and spoken to him in the past.

Prosecutor Rodney Jameson told the jury at the start of the trial that they would also be hearing evidence from a professor based in Scotland, who was a leading expert in facial mapping.

He explained how the professor had superimposed images of the petrol bomb thrower on to existing photos of Rashid to check the relevant positions of various features.

Mr Jameson pointed out that officers had also recovered a black jacket from Rashid's address and said it was the Crown's case that it was the jacket being worn by the petrol bomb thrower that night.

The trial continues.