Israeli President Shimon Peres warned on Sunday that an Israeli attack on Iran is becoming increasingly likely. Peres’ comments comes just days before a highly anticipated report by the International Atomic Energy Agency on Iran’s nuclear program. According to the Washington Post, the report will claim Iran has mastered the critical steps needed to build a nuclear weapon. The IAEA report is also expected to state that Iran has received crucial technical assistance from foreign weapon scientists from Russia, Pakistan and North Korea. Meanwhile, the Israeli newspaper Ha’aretz reports U.S. officials are increasingly concerned that Israel will not warn them before taking military action against Iran’s alleged nuclear facilities. One official said the United States is “absolutely” concerned that Israel is preparing an attack on Iran’s nuclear facilities.