Prosecutor Fatou Bensouda said in a statement that a preliminary examination found "a reasonable basis to believe that war crimes and crimes against humanity" were committed in Afghanistan after US-led troops moved in following the September 11, 2001, attacks.
Once the prosecutor submits her investigation request to the court, which is based in the Dutch city of The Hague, it's then up to the tribunal's judges to decide whether to open one. Bensouda's office said her request will be filed publicly "in the days to come".
Human Rights Watch welcomed the announcement as a step toward ending impunity for crimes in Afghanistan.
"Thousands and thousands of Afghans have suffered horrendous human rights abuses and war crimes over the years and there has been no accountability," Richard Dicker of the group's international justice program told The Associated Press. "The announcement today by the prosecutor opens the door to the possibility that for the first time there may be some justice possible for the victims."
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Taliban and Afghan government forces also may have used torture and committed other atrocities in Afghanistan's long and bitter conflict, the report said.
Bensouda said in a statement Friday that if judges approve an investigation, her office "will investigate, within its mandate and means, in an independent, impartial and objective way, crimes within the Court's jurisdiction allegedly committed by any party to the armed conflict."
However, legal experts say the chances of American service members being charged and sent to face justice at the ICC are remote.
Katherine Gallagher, senior staff attorney at the U.S. rights organisation the Center for Constitutional Rights, said the possibility that Americans could be charged sends a "long overdue message that no one is above the law."
Established in 2002, the International Criminal Court is the world's first permanent court set up to prosecute war crimes, crimes against humanity and genocide.
Bensouda's 2016 report said the alleged US war crimes "were not the abuses of a few isolated individuals. Rather, they appear to have been committed as part of approved interrogation techniques in an attempt to extract 'actionable intelligence' from detainees."
The prosecutor's report noted that US authorities have conducted dozens of investigations and court-martial cases.
After the September 11 attacks, the Bush administration allowed the use of waterboarding, which simulates drowning, and other interrogation techniques against suspected terrorists. President Barack Obama banned such practices after taking office in 2009.
"We have seen that arrest and surrender is the Achilles heel of international justice," Dicker said.
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