Currently, all homicide investigation in London is undertaken by the Specialist Crime and Operations Directorate's Homicide Command, which is split geographically into six units (West, Central, East, Northwest and South), each led by a Detective Superintendent. Each of the Command Units has 4 Major Investigation Teams (MITs), consisting of 50 staff, led by a Detective Chief Inspector (DCI), who performs the role of senior investigating officer (SIO).