Tevin Birmingham and Warren Blake guilty of attacking prison officers after verdicts in trial for killing Andrew McGowan from Yarmouth

Andrew McGowan. (Image: Supplied)

Tevin Birmingham, 22, and Warren Ricardo Blake, 19, had a 'kick off' following verdicts returned by a jury at Norwich Crown Court.

Trouble flared after Blake was found guilty of the murder of Andrew McGowan, 33, in Great Yarmouth in 2015 and Birmingham of manslaughter following a trial in June last year.

Both have been on trial at Norwich Magistrates Court after they denied assaulting officers on June 30 2016.

Magistrates heard both defendants were taken back to the cells area but refused to go in before it kicked off and a melee resulted, in which some custody officers were assaulted and others 'put in fear of their own personal safety'.

Dickens Court, Yarmouth. PHOTO: Nick Butcher (Image: �archant2016)

Birmingham, of Whitemoor Prison, Cambridgeshire, was convicted of one count of assault against one officer but cleared of a second assault and was given 12 weeks custody - which will be served alongside the 15-year sentence he is serving for manslaughter.

Blake, of HM Prison and Remand Centre, Chelmsford, was found guilty of two counts of assault against officers and given 26 weeks which again will be served alongside the life sentence he received.

Chairman of the bench John Dennehy said they had assaulted prison officers who were just doing their job.

However he accepted that it happened at an 'emotional' time.

Afame Offiah, for Birmingham, said it was clearly a serious incident. 'He's paid for what he's done.'

Chris Waymont, for Blake, said: 'He's going to be serving a long period in custody.'

Blake has already been told he will serve a minimum of 17 years in custody for murder.

An impact statement by one of the prison officers said that the incident had a deep effect on him.