Speaking on the 13th anniversary of the September 11, 2001 combined terror strikes on the United States, Prime Minister Binyamin Netanyahu said Thursday that Israel mourns those who were killed in the attacks, alongside the US.

“On 9/11,” he reminded his audience at the annual International Institute for Counter-Terrorism conference in Herzliya, “the people in the Gaza Strip celebrated on the roofs and handed out sweets. We mourned, and that is the moral difference between us.”

“Israel fully supports Obama’s call for a united action against ISIS,” he said, and added that Islamic State, Hamas, al-Qaeda, Hezbollah and Nigeria’s Boko Haram are all “branches of the same poisonous tree.”

Netanyahu said that new alliances are being formed by Arab states in the region as a result of the threat of extremist Islamist terrorism. These Arab states, he explained, “are reevaluating their relationships with Israel and realizing that Israel is not their enemy, but their ally.”

“I’m confident that militant Islam will perish but we shall not let anyone perish with it before it goes down,” he added.