PRISON chiefs have built a riot-proof block for up to 200 'troublemakers' at Whitehead detention centre following the mass breakout this year. Authorities have designed the unit to prevent detainees using furniture and building materials to fashion homemade weapons. Plastic beds have replaced sleeping platforms, cupboards are wooden instead of steel and the walls are made of brick instead of potentially-lethal metal. The unit is part of a $65 million security upgrade in the wake of riots in May, when more than 119 Vietnamese escaped by toppling three 10-metre metal fences. Some 300 people were moved to prisons after detainees rampaged through the camp, setting buildings and cars ablaze. Correctional Services staff later confiscated a haul of homemade weapons. An identical secure section has been built at High Island camp, which houses 3,864 northern Vietnamese, and about 20 people have been moved in. It is believed the high security huts could house more than 100 boat-people who have remained in Victoria and Pik Uk prisons since the riot. 'I think the idea is to put the people in prison back into the camps, to make space in our penal institutions,' a CSD source said. 'We ought to keep the Vietnamese in camps. They are not prisoners and we do not really want to put them into prisons. 'We've used materials and equipment which they cannot turn into weapons and cannot set fire to. 'For the dorms, we've used bricks rather than corrugated metal. Bricks can be used as weapons, but it would take too long to dismantle the walls. 'The beds are plastic and the cupboard doors are wooden. If you have steel you can take off the handles and make them into weapons.' The Vietnamese rioters now being held in prisons have not been charged with any crime, and were transferred for 'management purposes' according to the CSD. But Refugee Concern lawyer Pam Baker said that the detainees should not be moved into the new, high-security huts. 'They picked up whole families who had got out to get fresh air because of the CS gas. The mums and kids went back [to the camps], but the men were left in Victoria and Pik Uk. 'Really, they must let them go back to their families, bearing in mind they have not been charged and have not committed any crime.' 'They cannot put them in these blocks.'