Shortly before the Second Battle of Fallujah, MI6 personnel visited JSOCs TSF (Temporary Screening Facility) at Balad Air Base to question a suspected insurgent. Afterwards, they raised concerns about the poor detention conditions there. As a result, the British government informed JSOC in Iraq that prisoners captured by British special forces would only be turned over to JSOC if there was an undertaking not to send them to Balad. In spring 2005, the SAS detachment operating in Basra and southern Iraq, known as Operation Hathor, escorted MI6 case officers into Basra so they could meet their sources and handlers. MI6 provided information that enabled the detachment to carry out surveillance operations. MI6 were also involved in resolving the Basra prison incident; the SIS played a central role in the British withdrawal from Basra in 2007.