Executives from the security firm G4S have said they were ashamed by revelations of abuse at an immigration detention centre run by the company.
They were appearing before MPs on the Home Affairs Committee, who condemned the firm's management of Brook House Immigration Removal Centre, near Gatwick Airport.
The executives were accused of failing to "get a grip" and overseeing major failings at the centre.
The chair of the committee, Yvette Cooper, told them it was a matter of "very grave concern" that the company appeared to have failed to stop staff misbehaviour following earlier revelations of mistreatment at a young offenders' unit.
The committee also heard evidence from a former G4S duty director at Brook House, who said he had raised concerns about staff and management culture in institutions run by the company between 2001 and his resignation in 2014.
Nathan Ward told the MPs that he was "not surprised but shocked" at the level of abuse revealed in the BBC Panorama film.