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NaCTSO - Who we are and what we do.

The National Counter Terrorism Security Office (NaCTSO) is a police unit co-located within the Centre for Protection of National Infrastructure (CPNI.) It is funded by a Home Office grant and works to the Office for Security and Counter Terrorism [OSCT] reporting activity to the Association of Chief Police Officers (ACPO) Director Protect and Prepare.

NaCTSO contributes to the UK government’s counter terrorism strategy (CONTEST) by supporting the Protect and Prepare strands of that strategy. NaCTSO counter terrorism and security work is divided into three areas:

  • Protection of crowded places;
  • Protection of hazardous sites and dangerous substances; and
  • Assisting the CPNI to protect the Critical National Infrastructure.

Our staff can offer specialist advice regarding the security of explosives and pre-cursor chemicals (including fertilisers), pathogens and toxins, radiological sources and other toxic chemicals. We also provide guidance in relation to business continuity, designing out vehicle borne terrorism, the protection of crowded places and reducing opportunities for terrorism through environmental design.

To achieve national delivery on behalf of the ACPO, NaCTSO trains, tasks and coordinates a nationwide network of centrally funded, specialist police advisers known as CTSAs. The primary role of these advisers is to provide help, advice and guidance on all aspects of counter terrorism protective security across a variety of sectors. See 'Our Services'.


Project ARGUS is a National Counter Terrorism Security Office initiative, exploring ways to aid you in preventing, handling and recovering from a terrorist attack.