Four prisoners involved in a riot at Waikeria Prison yesterday surrendered to staff overnight. Sixteen prisoners remain non-compliant, but are within the secure perimeter of the 'top jail' facility. Yesterday they set fire to mattresses and sgot on the roof. Corrections staff, including Specialist Advanced Control & Restraint teams, have been negotiating with them. Dr Rawiri Waretini-Karena is an independent advisor to the Department of Corrections, and in 1986 he was a prisoner in Waikeria Prison, when a riot broke out. He told Perlina Lau that negoiations with the prisoners should be with treatment with dignity and integrity.