National Counter Terrorism Security Office

Latest from the National Counter Terrorism Security Office

See all latest documents

What we do

The National Counter Terrorism Security Office (NaCTSO) is a police hosted 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


Guidance and regulation

See all guidance and regulation

News and communications

See all news and communications

Contact NaCTSO

Action Counters Terrorism: Report Suspicious Behaviour

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

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

Report online material promoting terrorism or extremism

Report illegal or harmful information, pictures or videos you’ve found on the internet. You can make your report anonymously.

Contact your local Counter Terrorism Security Advisers

Counter terrorism security advisers help businesses and local communities. Contact your CTSA for help and guidance on security and details of local awareness events.

National Counter Terrorism Security Office

PO Box 849
United Kingdom

Main switchboard

+44 (0)207 931 7142

Enquiries should be addressed to your local CTSA in the first instance. To report suspicious behaviour please use the Confidential Hotline.

Media enquiries

National Police Chiefs' Council Press Office
10 Victoria Street
United Kingdom


020 3276 3803

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