The group's role is to provide specially trained officers and resources for cases requiring covert policing and evidence gathering. It had responsibility for all undercover policing in London, particularly focusing on surveillance and relying on support from armed officers and specialist surveillance photography. Some of their most notable work is that in counter-terrorism operations, the most high profile of which led to the shooting of Brazilian Jean Charles de Menezes who was mistakenly identified as a suspected suicide bomber on 22 July 2005.