1990 Strangeways Prison riot April, HM Prison Durham, HM Prison Winchester and HM Prison Wandsworth on 4 April, and HM Young Offenders Institute Glen Parva on 6 April. The weekend of 7 April and 8 April saw protests across the prison system. At HM Prison Leeds there was a sit-down protest after the arrival of over 100 prisoners who had been transferred from Strangeways. At HM Prison Dartmoor, between 100 and 120 prisoners wrecked D wing of the prison, and 12 prisoners also protested on the roof of C wing unfurling a banner that read "Strangeways, we are with you". 32 prisoners from Dartmoor
HM Prison Ashwell which extended to the edges of Oakham. Several prisoners were evacuated from the prison. Trouble started at approximately 0100 BST on 11 April and a fire broke out at the prison during the afternoon. The riot was successfully brought under control at 2245 BST that day. The operation launched by authorities in response to the riot was called Operation Tornado which saw the introduction of specialist riot-trained prison staff. Three prisoners were injured and 75% of the prison was made uninhabitable. The riot started when a prisoner, serving a three-year sentence, confronted staff and refused to return to his room.