The prosecutor of the International Criminal Court said Monday that she had a “reasonable basis to believe” that American soldiers committed war crimes in Afghanistan, including torture.

The international prosecutor has been considering whether to begin a full-fledged investigation into potential war crimes in Afghanistan for years. In Monday’s announcement, the prosecutor, Fatou Bensouda, signaled that a full investigation was likely.

Still, the prosecutor did not announce a final decision on an investigation, which would have to be approved by judges, and it is unlikely that the United States will cooperate.

The United States is not a party to the court, which was established to prosecute war crimes, crimes against humanity and genocide. But Afghanistan is a member of the court, so allegations of crimes committed in its territory, no matter the nationality of the perpetrators, are widely considered to be fair game.