It's the first time that Francis has openly urged for an investigation of genocide accusations over Israel's actions in the Gaza Strip.

In September, he said Israel's attacks in Gaza and Lebanon have been “immoral” and disproportionate, and that its military has gone beyond the rules of war.

The book, by Hernán Reyes Alcaide and based on interviews with the Pope, is entitled “Hope never disappoints. Pilgrims towards a better world."

It will be released on Tuesday ahead of the pope's 2025 jubilee. Francis’ yearlong jubilee is expected to bring more than 30 million pilgrims to Rome to celebrate the Holy Year.

“According to some experts, what is happening in Gaza has the characteristics of a genocide,” the pope said in excerpts published Sunday by the Italian daily La Stampa.

“We should investigate carefully to determine whether it fits into the technical definition formulated by jurists and international bodies,” he added.

Last year, Francis met separately with relatives of Israeli captives in Gaza and Palestinians living through the war and set off a firestorm by using words that Vatican diplomats usually avoid: “terrorism” and, according to the Palestinians, “genocide.”

Francis spoke at the time about the suffering of both Israelis and Palestinians after his meetings, which were arranged before the Israeli-Hamas captives deal and a temporary halt in fighting was announced.

The pontiff, who last week also met with a delegation of Israeli captives who were released and their families pressing the campaign to bring the remaining captives home had editorial control over the upcoming book.