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About Us
About us
Find out more about MI5’s mission and core values; our people who work to keep the country safe; and our rich and varied history.
- People
  People
  - Workforce information
- Director General
  Director General
  - Former Directors General
- Joint Terrorism Analysis Centre
  
  Joint Terrorism Analysis Centre
- Joint State Threats Assessment Team
  
  Joint State Threats Assessment Team
- National Protective Security Authority
  
  National Protective Security Authority
- Where we work
  Where we work
  - Thames House
- Partnerships
  Partnerships
  - Cinquefoil Trust
- Purpose and Values
  
  Purpose and Values
- Thames House
  
  Our headquarters, Thames House, in central London is a Grade II listed building in Westminster, not far from the Houses of Parliament.
  
  Thames House
  
  Our headquarters, Thames House, in central London is a Grade II listed building in Westminster, not far from the Houses of Parliament.
What we do
What we do
Find out about the core threats to national security that MI5 exists to protect against.
- Countering terrorism
  
  Countering terrorism
- Countering state threats
  
  Countering state threats
- Protective security
  
  Protective security
- National Protective Security Authority
  
  The National Protective Security Authority (NPSA) is part of MI5 and offers advice to businesses and organisations to help keep them and their customers safe from a range of national security threats.
  
  National Protective Security Authority
  
  The National Protective Security Authority (NPSA) is part of MI5 and offers advice to businesses and organisations to help keep them and their customers safe from a range of national security threats.
How we work
How we work
Discover how MI5 works to protect against threats to national security through intelligence gathering techniques, partnerships and legislation.
Threats and Advice
Threats and Advice
Find out how you can play your part in keeping the country safe – either as a member of the public, or as a potential new recruit.
- Terrorism threat levels
  
  Terrorism threat levels
- Resources and Links
  
  Resources and Links
- National Protective Security Authority
  
  The National Protective Security Authority (NPSA) is part of MI5 and offers advice to businesses and organisations to help keep them and their customers safe from a range of national security threats.
  
  National Protective Security Authority
  
  The National Protective Security Authority (NPSA) is part of MI5 and offers advice to businesses and organisations to help keep them and their customers safe from a range of national security threats.
History
History
Find out more about the history of MI5.
News
Careers

About Us
About us
Find out more about MI5’s mission and core values; our people who work to keep the country safe; and our rich and varied history.
- People
  People
  - Workforce information
- Director General
  Director General
  - Former Directors General
- Joint Terrorism Analysis Centre
  
  Joint Terrorism Analysis Centre
- Joint State Threats Assessment Team
  
  Joint State Threats Assessment Team
- National Protective Security Authority
  
  National Protective Security Authority
- Where we work
  Where we work
  - Thames House
- Partnerships
  Partnerships
  - Cinquefoil Trust
- Purpose and Values
  
  Purpose and Values
- Thames House
  
  Our headquarters, Thames House, in central London is a Grade II listed building in Westminster, not far from the Houses of Parliament.
  
  Thames House
  
  Our headquarters, Thames House, in central London is a Grade II listed building in Westminster, not far from the Houses of Parliament.
What we do
What we do
Find out about the core threats to national security that MI5 exists to protect against.
- Countering terrorism
  
  Countering terrorism
- Countering state threats
  
  Countering state threats
- Protective security
  
  Protective security
- National Protective Security Authority
  
  The National Protective Security Authority (NPSA) is part of MI5 and offers advice to businesses and organisations to help keep them and their customers safe from a range of national security threats.
  
  National Protective Security Authority
  
  The National Protective Security Authority (NPSA) is part of MI5 and offers advice to businesses and organisations to help keep them and their customers safe from a range of national security threats.
How we work
How we work
Discover how MI5 works to protect against threats to national security through intelligence gathering techniques, partnerships and legislation.
Threats and Advice
Threats and Advice
Find out how you can play your part in keeping the country safe – either as a member of the public, or as a potential new recruit.
- Terrorism threat levels
  
  Terrorism threat levels
- Resources and Links
  
  Resources and Links
- National Protective Security Authority
  
  The National Protective Security Authority (NPSA) is part of MI5 and offers advice to businesses and organisations to help keep them and their customers safe from a range of national security threats.
  
  National Protective Security Authority
  
  The National Protective Security Authority (NPSA) is part of MI5 and offers advice to businesses and organisations to help keep them and their customers safe from a range of national security threats.
History
History
Find out more about the history of MI5.
News
Careers

Five Eyes Joint Bulletin - Safeguarding Our Secrets

Published date: 03 Jun 2026

On 3 June 2026, members of the Five Eyes intelligence partnership (ASIO, CSIS, FBI, MI5 and NZSIS) released a joint bulletin, Safeguarding our Secrets, warning of the threat posed by China's military intelligence services on Western professional networking sites and online job platforms.

The bulletin warns that Chinese intelligence officers are posing as online recruiters and consultants who represent fake "cover companies" located outside China, to target individuals with access to classified or privileged information, and outlines some of the methodologies used. To access the full bulletin please click here to download.

For guidance on identifying and mitigating this risk, job seekers should refer to the National Protective Security Authority's (NPSA) guidance, Applicant Beware.

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MI5 has issued a Security Service Espionage Alert stating that the primary purpose of the CGTRI 中国通用技术研究院 is to fund research that directly improves Chinese Ministry of State Security (MSS) technical capability for espionage.

DG Statement on the 25th Anniversary of the 9/11 Attacks

MI5 Director General Sir Ken McCallum gave a statement on the 25th anniversary of the 9/11 terrorist attacks.

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Director General Sir Ken McCallum made a statement following the publication of the IPCO report on the Investigation into the provision of false evidence to the High Court and the Investigatory Powers Tribunal in relation to Agent X.

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