Oslo Police District has a series of special divisions and task forces which provide aid to all other police districts when necessary. It is responsible for the two police helicopters, which is mostly used for traffic motoring, search and rescue and apprehension. The tactical unit Delta is for terrorism, sabotage and hostage incidents, which is separate from the crisis and hostage negotiation service. Oslo's dog patrol service includes the national bomb squad. The departments further has a mobile deployment squad against demonstrations and riots, a Police Negotiation Unit for use against barricades and kidnapping, a mounted police, and the responsibility for protecting high-ranking government and royal officials.National Police Directorate (2010): 13
