Office of the Prosecutor

The Office of the Prosecutor (OTP) is an independent organ of the Court. It is responsible for examining situations under the jurisdiction of the Court where genocide, crimes against humanity, war crimes and aggression appear to have been committed, and carrying out investigations and prosecutions against the individuals who are allegedly most responsible for those crimes. It is the first time in history that an international Prosecutor has been given the mandate, by an ever-growing number of States, to independently and impartially select situations for investigation where atrocity crimes have been or continue to be committed on their territories or by their nationals. Like the judges of the Court, the Prosecutor and Deputy Prosecutors are elected by the ASP for a non-renewable mandate of nine years.

Who is in the OTP?

The OTP benefits from the services of approximately 380 dedicated staff members from over 80 different nationalities, including members of the legal profession, investigators and analysts, psycho-social experts, individuals with experience in diplomacy and international relations, public information and communication, and more.

The current Prosecutor is Mr. Karim A.A. Khan KC from the United Kingdom and his Deputies are Mr. Mame Mandiaye Niang (Senegal) and Nazhat Shameem Khan (Fiji).

How does the OTP start its operations?

Under article 13 of the Rome Statute, there are three ways the exercise of the Court's jurisdiction can be triggered where crimes under the Court's jurisdiction appear to have been committed. In all three instances, the Prosecutor must carry out an independent and impartial evaluation before deciding to proceed:

  1. Any State Party of the Rome Statute may refer a situation requesting the Prosecutor to carry out an investigation. The Prosecutor will open an investigation if the legal criteria are met.

  2. The United Nations Security Council (UNSC) may also refer a situation to the Prosecutor, who will open an investigation if the legal criteria are met.

    • To date, this happened in the situations of Darfur (Sudan) and Libya.

  3. Finally, the Prosecutor may open an investigation on his own initiative. The Prosecutor may decide to open an investigation – if the Prosecutor decides to proceed, he must seek legal authorization from the judges.

  4. A State not Party to the Statute may also accept the exercise of jurisdiction on an ad hoc basis, by submitting a declaration pursuant to article 12(3) of the Rome Statute. An ad hoc declaration is not the same as a referral and still requires the triggering of the Court’s jurisdiction – which can happen by one or more States Parties referring the situation or by the Prosecutor seeking authorization from the judges.

The Court’s jurisdiction may be exercised with respect to any Rome Statute crime committed on the territory or by the nationals of a State Party. The same applies where a State not Party to the Statute lodges a declaration with the Court.

The only exception to the above is where the UNSC refers a situation under Chapter VII of the UN Charter, which can relate to any situations involving any UN Member State (including with respect to the territory of a State not Party to the Rome Statute).

Yes, if they are alleged to have committed Rome Statute crimes on the territory of a State Party, or of a State that has lodged an ad hoc declaration.

Yes. The Court can investigate alleged Rome Statute crimes committed by the nationals of States Parties anywhere in the world (even if not committed on the territory of a State Party).

Preliminary examinations

Any individual, group or State can send information to the OTP regarding alleged crimes falling under the jurisdiction of the Court. To date, the OTP has received thousands of such communications, which can form the initial basis of the Office's preliminary examinations.

Stakeholders, including affected communities, civil society or national authorities, can share information to the Office easily and securely through its digital evidence submissions platform called OTP Link:

The OTP conducts a preliminary examination to decide whether there is a reasonable basis to initiate an investigation.

In doing so, the OTP is required to assess and verify a number of legal criteria. These include, among others: if the crimes were committed after 1 July 2002, the date of the entry into force of the Rome Statute, the Court's founding treaty; if the crimes took place in the territory of a State Party or were committed by a national of a State Party (unless the situation was referred by the UN Security Council); if they amount to war crimes, crimes against humanity or genocide; the gravity of these crimes; if there are no genuine investigations or prosecutions for the same crimes at the national level; and if opening an investigation would not serve the interests of justice and of the victims.

National authorities bear the primary responsibility, in the first instance, to investigate and prosecute those most responsible for the commission of mass crimes. The Court will initiate investigations, in accordance with the legal criteria set by the Rome Statute, only when the national authorities have failed to uphold this primary responsibility and in the absence of genuine national proceedings.

There are no timelines provided in the Rome Statute for bringing a preliminary examination to a close. Depending on the facts and circumstances of each situation, the Prosecutor may decide either to: (i) decline to initiate an investigation; (ii) continue to collect information on crimes and relevant national proceedings in order to make a determination; or (iii) initiate the investigation, subject to judicial authorisation as appropriate.

Preliminary examinations also provide an opportunity to the OTP to encourage national authorities to fulfil their primary responsibility to carry out national investigations and prosecutions themselves. In applying the Rome Statute criteria, should the OTP determine it needs to open an investigation, it will do so without hesitation. Political considerations never form part of the Office's decision making.


To conduct its investigations, generally, the OTP sends missions – usually composed of investigators, cooperation advisers, and if necessary, prosecutors – to concerned countries, collects and examines different forms of evidence, and questions a range of persons, from those being investigated to victims and witnesses. To undertake these activities, the OTP relies on the assistance and cooperation of States Parties, international and regional organisations, as well as civil society.

In the process of gathering evidence, the OTP identifies the gravest incidents and those most responsible for these crimes. The OTP has an obligation to gather both incriminating and exonerating evidence, in order to establish the truth about a given situation. The exonerating information will be disclosed to the Defence teams as part of the proceedings.

Once the OTP considers that it has sufficient evidence to prove before the judges that an individual is responsible for a crime in the Court's jurisdiction, the Office will request the judges to issue a warrant of arrest or a summons to appear.

Applying for an Arrest Warrant or Summons to Appear

Based on the evidence it gathers during an investigation, the OTP can submit a request to the ICC judges, asking them to issue arrest warrants or summonses to appear.

Once the judges determine that there are reasonable grounds to believe that a person has committed a crime within the Court's jurisdiction, the judges will only issue an arrest warrant to ensure the person's appearance at trial, to ensure the person does not obstruct or endanger the investigation or Court proceedings, or to prevent the person from continuing to commit the crime in question.


Once issued, even in cases where arrests are delayed, arrest warrants are valid for life. Once arrested, suspects are held in custody at the Court's detention centre.

Alternatively, judges can issue summonses to appear, when there are reasonable grounds to believe that a summons is sufficient to ensure the person's appearance. Defendants subject to summonses to appear come before the Court voluntarily and are neither arrested nor held in the Court's custody.


Once the person for whom an arrest warrant or a summons to appear has been issued is in the Court's custody or decides to come voluntarily to the Court, the OTP will first have to convince the judges, at the Pre-Trial phase, that it has sufficient evidence to commit the case to trial. At this stage, the judges will have to decide whether to confirm, decline, or review the charges presented by the Office of the Prosecutor against the defendant.

If the judges confirm the charges, the case goes to trial. Once at trial, the OTP is first to present its case, and bears the burden of proof that the accused person is guilty beyond reasonable doubt.

The OTP can present evidence in the form of documents, other tangible objects, or witness statements; the OTP's witnesses are also questioned by the Defence, and vice versa.

As part of the proceedings, the OTP discloses both incriminating and exonerating information to the Defence. The OTP is obligated to gather both during its investigations, in order to establish the truth about a given situation.

Once the OTP has presented all its evidence, it is the turn of the accused, with the assistance of his or her counsel, to present his or her Defence.

The OTP, in partnership with the Sanela Diana Jenkins Human Rights Project at UCLA School of Law, has launched the Human Rights & International Criminal Law Online Forum, promoting open discussion on complex issues of international criminal law faced by the OTP. Please visit the Forum at: