The International Criminal Court’s chief prosecutor said Friday she wanted to open a full investigation into alleged war crimes in the Palestinian territories, sparking a furious reaction from Israel and condemnation from the United States.

A Palestinian statement welcomed the move by the ICC following a five-year preliminary probe by the prosecutor into the situation since the 2014 war in Gaza.

Israeli Prime Minister Benjamin Netanyahu said the decision made the Hague-based court — which Israel has refused to sign up to since its creation in 2002 — a “political tool” against the Jewish state.

ICC prosecutor Fatou Bensouda said in a statement: “I am satisfied that there is a reasonable basis to proceed with an investigation into the situation in Palestine. In brief, I am satisfied that war crimes have been or are being committed in the West Bank, including east Jerusalem, and the Gaza Strip.”

She did not specify the perpetrators of the alleged crimes.

She said that before opening a full probe, she would ask the ICC to rule on the territory over which it has jurisdiction because of the “unique and highly contested legal and factual issues attaching to this situation.”

“Specifically, I have sought confirmation that the ‘territory’ over which the court may exercise its jurisdiction, and which I may subject to investigation, comprises the West Bank, including east Jerusalem, and Gaza.”

The prosecutor added, however, that she did not require any authorization from judges to open a probe because there had been a referral from the Palestinians, who joined the court in 2015.

U.S. Secretary of State Mike Pompeo said: “We firmly oppose this and any other action that seeks to target Israel unfairly. We do not believe the Palestinians qualify as a sovereign state, and they therefore are not qualified to obtain full membership or participate as a state in international organizations, entities or conferences, including the ICC.” Israel is America’s top ally in the region.

The issue is highly sensitive, with former White House national security adviser John Bolton threatening last year to arrest ICC judges if they moved against Israel or the United States.

Both countries have refused to sign up to the court, which was set up in 2002 to be the only global tribunal trying the world’s worst crimes, war crimes and crimes against humanity.

Bensouda launched a preliminary probe in January 2015 into allegations of war crimes and crimes against humanity in Israel and the Palestinian territories, in the wake of the 2014 Gaza war.

A full ICC investigation could possibly lead to charges against individuals. States cannot be charged by the ICC.

The Palestinian statement said, “Palestine welcomes this step as a long-overdue step to move the process forward towards an investigation, after nearly five long and difficult years of preliminary examination.”

Netanyahu lashed out at what he called a “dark day for truth and justice,” saying “The ICC prosecutor’s decision has turned the International Criminal Court into a political tool to delegitimize the state of Israel.”

The ICC’s preliminary investigation has looked at the 2014 war, which left 2,251 dead on the Palestinian side — the majority of them civilians — and 74 on the Israeli side, most of them soldiers. It has also looked at violence near the Israel-Gaza border in 2018.

Earlier this month, the ICC prosecutor refused to press charges over a 2010 Israeli raid on a flotilla bringing aid to Gaza, and urged the probe be shut. Nine Turks died when Israeli Marines stormed the Mavi Marmara, among eight ships trying to break a naval blockade of the Gaza Strip. One more died in a hospital in 2014.