Understanding the Colours of Interpol Notices

An entrepreneur landed at an EU airport in early 2026 and was immediately detained. Why? A ‘Diffusion’—a direct police alert—had been issued by a former business partner's country. It had frozen his ability to travel and conduct business for months, long before INTERPOL's own legal team had even seen it. He had no idea an international alert existed in his name.

That story is more common than you think. INTERPOL issues several types of colour-coded notices to its 196 member countries, each serving a distinct function for international police cooperation. You have likely heard of Red Notices for wanted persons, but there are also Blue Notices to gather information and Yellow Notices for missing people. It's crucial to understand these are not international arrest warrants. They are simply requests for police forces to cooperate across borders, and how a country acts on that request depends entirely on its own laws.

INTERPOL Notice - An international alert circulated by the INTERPOL General Secretariat at the request of a member country, used to share information or request action regarding wanted persons, missing persons, or potential threats. The validity and legal effect of a notice depend on the national laws of each member country.

INTERPOL Diffusion - A less formal alert sent directly from one member country's National Central Bureau (NCB) to any number of other NCBs. It serves a similar purpose to a notice but bypasses the initial review process by INTERPOL's General Secretariat, making it a faster but potentially riskier tool.

What is the difference between an INTERPOL Red Notice and a Blue Notice?

The fundamental difference is purpose. A Red Notice is a request to arrest someone. A Blue Notice is just a request to gather information. While both are critical tools for criminal investigations, they carry vastly different legal consequences for the person named.

What is a Red Notice?

A Red Notice is issued for fugitives wanted either for prosecution or to serve a sentence. It works as a global request to law enforcement to find and provisionally arrest a person, pending extradition or similar legal action. For a member country's request to be valid, it must be supported by a solid legal instrument—usually a national arrest warrant or a court order—as demanded by INTERPOL's own Rules on the Processing of Data.

Before any Red Notice goes out to member countries, it must pass a compliance check by INTERPOL’s Notices and Diffusions Task Force (NDTF). The goal is to ensure the request meets all procedural rules and doesn't violate INTERPOL's Constitution. Specifically, the check focuses on Article 3, which strictly forbids the organisation from getting involved in any activities of a political, military, religious, or racial character.

What is a Blue Notice?

A Blue Notice, also called an "enquiry notice," is for collecting more information about a person’s identity, location, or criminal activities. This is purely an investigative tool. It is not a request for arrest. For instance, a country might issue a Blue Notice to track down a witness or trace the movements of someone suspected of being involved in a crime.

What is the Interpol Blue Notice search?

There is no public database or "list" for Blue Notices. Simple as that. Like most INTERPOL data, Blue Notices are restricted to the secure I-24/7 police communications system, accessible only to authorized law enforcement bodies. An individual can't just go online and check for one. Discovering a Blue Notice usually happens through official contact with police or by making a formal request for your data from the Commission for the Control of INTERPOL’s Files (CCF).

How are Yellow Notices used for missing persons?

A Yellow Notice is a global police alert for locating missing persons, especially minors, or to help identify people who cannot identify themselves. Think of it as a humanitarian tool for cases where a missing person might have crossed international borders.

These notices pack in vital information: photos, physical descriptions, fingerprints if available, and details about the disappearance. When a border official in any member country encounters someone matching a Yellow Notice, they can act to identify them and alert the country that issued it. This system is crucial in cases of parental abduction, human trafficking, or for individuals who have tragically lost their memory. To get an invalid alert taken down, you must go through the process of removing INTERPOL data.

What is an INTERPOL Diffusion and how is it different from a notice?

A Diffusion is a faster, more direct way for member countries to communicate. But that speed comes with a significant risk of misuse. It acts much like a notice but is sent directly by a country's National Central Bureau (NCB) to any other NCBs it chooses.

What is an INTERPOL Diffusion Notice?

This is a common but technically incorrect term. A Diffusion is a distinct type of alert, not a "notice." The critical difference is the procedure. While a Red Notice must be reviewed and approved by INTERPOL's General Secretariat *before* it circulates, a Diffusion is sent *immediately*. The legal review by INTERPOL happens only *after* the alert is already live in foreign police databases.

This "circulate first, review later" model means an individual can suffer serious harm—arrest, a frozen bank account, being denied entry to a country—from a Diffusion that is later found to be non-compliant. This is especially dangerous when countries misuse the system for political or commercial disputes, something explicitly forbidden by Article 3 of INTERPOL's Constitution. And while INTERPOL now attaches a warning to Diffusions that they are pending review, by the time anyone sees it, the damage can already be done.

How can someone challenge an INTERPOL notice or Diffusion?

The main way to fight an INTERPOL alert is by submitting a request to the Commission for the Control of INTERPOL’s Files (CCF). The CCF is an independent body that ensures all data processed by INTERPOL follows the organization's rules.

A request can be made for access to your data, to correct it, or to delete an alert entirely. To get an alert deleted, your argument must be strong. The main grounds for a request are:

1. The case violates Article 3: You have to prove the matter is predominantly political, military, religious, or racial, not a legitimate criminal case.
2. It lacks a valid legal basis. This could mean the national arrest warrant has expired, the case doesn't meet the minimum sentencing threshold required for a Red Notice, or the charges were dropped in the home country.
3. A violation of human rights. For example, showing that the person would face a risk of torture or a sham trial if extradited.

The process of challenging an INTERPOL alert is a complex legal battle. It requires detailed submissions and solid evidence to convince the CCF that the data is non-compliant and must be removed.

This article is published by an independent law firm for informational purposes only and does not represent or claim affiliation with any government body, international organization, or official authority.

Frequently asked questions

Is a Blue Notice an arrest warrant?

No — a Blue Notice is used to locate or gather information about a person, not to request arrest.

Can a Blue Notice become a Red Notice?

A country could separately seek a Red Notice; they are distinct notices with different purposes.

Which notices can a CCF request address?

The CCF can review and, where justified, correct or delete Interpol data across notice types.

Do Interpol notices show at the border?

Some notices and diffusions can surface in checks; the effect depends on each country's systems.

Related reading

Red Notice lawyersCCF applicationRemoving a Red Notice