As of May 2018[update], there were 722 personnel in SCO 1, including 540 police officers and 182 civilian staff.
[2] MITs were established in 2000 to replace the former Area Major Incident Pools (AMIPs) as part of the MPS's Serious Crime Group.
In 2001, there were thirty-one murder investigation teams operating in London, made up of eight hundred and thirty-four police officers, one hundred and eighty-two civilian staff, and fourteen senior detectives.
Currently, all homicide investigation in London is undertaken by the Specialist Crime and Operations Directorate's Homicide Command, which is split geographically into five units (West, Central, East, North and South), each led by a Detective Superintendent.
Each of the Command Units has four Major Investigation Teams (MITs), consisting of fifty staff, led by a Detective Chief Inspector (DCI), who performs the role of senior investigating officer (SIO).