Steve Gay: Well, without knowing the precise circumstances of that particular job I would expect the engineer to do the checks that he would normally do, but essentially would isolate the system if there was suspicion of carbon monoxide, and advise the consumer to have the appliances tested and checked by a Corgi-registered installer.

BBC: Frontline Scotland graphic

Chamber officials say they haven't been able to keep intruders completely out of their system, but now can detect and isolate attacks quickly.

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They say Sao Paulo's prison system does not have the capacity to isolate such dangerous inmates and they should be transferred to federal prisons.

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