What we do

The National Counter Terrorism Security Office (NaCTSO) is a police unit that supports the 'protect and prepare' strands of the government’s counter terrorism strategy.

NaCTSO works with the Home Office.

Read more about what we do


Our announcements

Our publications

  1. Industry preparedness

    • Guidance
  2. Public vigilance

    • Guidance

See all our publications

Contact NaCTSO

Contact the Anti-Terrorist Hotline

It’s probably nothing but… if you see or hear anything that could be terrorist-related trust your instincts and call the Anti-Terrorist Hotline.

If you think you have seen person acting suspiciously, or if you see a vehicle, unattended package or bag which might be an immediate threat, move away and call 999.

Contact your local counter terrorism security advisers

Contact your CTSA for help and guidance on security and details of local Argus/Griffin events.

National Counter Terrorism Security Office

PO Box 849

Enquiries should be addressed to your local CTSA in the first instance. To report suspicious behaviour please use the Anti-Terrorist Hotline. Please note this mailbox is NOT monitored 24 hours a day.

Freedom of Information (FOI) Act

This organisation is not covered by the Freedom of Information Act. To see which organisations are included, see the legislation.

Corporate information

Jobs and contracts