The Ghana Police Service (GPS) and the Criminal Investigation Department (CID) are the main law enforcement agencies of the Republic of Ghana, and are responsible for the detection of crime, maintenance of law and order and the maintenance of internal peace and security. The Ghana Police Service has eleven specialised police units including a Militarized police Rapid deployment force (RDF) and Marine Police Unit (MPU). The Ghana Police Service operates in 12 divisions: ten covering the ten regions of Ghana, one assigned specifically to the seaport and industrial hub of Tema, and the twelfth being the Railways, Ports and Harbours Division. The Ghana Police Service's Marine Police Unit and Division handles issues that arise from the country's offshore oil and gas industry.