The group chief executive of G4S, Nick Buckles, remains in his post on Friday after two directors quit in the wake of a review into the company's Olympic Games contract.
G4S's chief operating officer David Taylor-Smith and global events specialist Ian Horseman Sewell have quit.
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Specially-trained prison security teams have been sent to HMP Hewell near Redditch, after trouble broke out on one of the prison's wings.
Household names are among 40 women to sign open letter to BBC Director General saying he must "act now" to end pay discrimination.
"We've never actually spoken so publicly about her," the Duke of Cambridge said. "But we felt that this was the right time to do it."