An offer of sunscreen to inmates who climbed onto a jail's roof in hot weather was "foolish", the prisons minister has said.
Jeremy Wright said that he has ordered an immediate review into the matter.
"This should not have happened," Mr Wright said.
"There should be no policies in place which promote this kind of foolishness and I have ordered an immediate review of this incident to ensure that it does not happen again."
More top news
It's all going on tonight - as belt of rain sweeps from in from the west - lively downpours will mean rumbles of thunder and hail
A baby boy, born yesterday into a disaster zone, has not yet been given a name as his family and his village wait for help.
Many survivors of the Nepal earthquake still desperately await basic practical help and the shadow of a health crisis looms large.