Nine staff have been suspended from a G4S immigration centre after claims of abuse and assaults against detainees.
An investigation has also been launched into allegations by the BBC's Panorama of "chaos, incompetence and abuse" at Brook House Immigration Removal Centre, near Gatwick.
The programme claims to have undercover footage showing officers "mocking, abusing and even assaulting detainees" at the facility where drugs are allegedly "rife".
G4S said nine staff have been suspended pending further investigation.
Jerry Petherick, managing director for custodial and detention services, said: "There is no place for the type of conduct described in the allegations anywhere in G4S.
"Such behaviour is not representative of the many G4S colleagues who do a great job, often in difficult and challenging circumstances, across the country.
"We have not yet been provided with the recorded evidence which forms the basis of the allegations and it is inappropriate for me to pre-judge the outcome of our investigation.
"Once we have seen the evidence and concluded the investigation, I will ensure that we take the appropriate action. We continue to focus on the care and wellbeing of detainees at Brook House."
The episode is due to air on BBC One at 9pm on Monday.