The most senior officers of all the civilian police forces also form part of the Police Service, which is a component of the civil service of Pakistan. Namely, there is four provincial police service including the Punjab Police, Sindh Police, Khyber-Pakhtunkhwa Police, and the Balochistan Police; all headed by the appointed senior Inspector-Generals. The ICT has its own police component, the Capital Police, to maintain law and order in the capital. The CID bureaus are the crime investigation unit and form a vital part in each provincial police service.