The two sides were due to meet for a sixth round of negotiations on Sunday. Tehran suggested that it had not yet decided whether to participate, given Israel’s attack on its nuclear infrastructure.

President Trump warned that a "massive" war could break out in the Middle East over Iran's nuclear program, after the U.N. nuclear watchdog said Iran wasn't complying with its nonproliferation duties.

Danny Danon, Israel's Ambassador to the United Nations, says the attacks against Iran will continue and can take "days or weeks." He says the threat from Iran was too great and Israel acted alone in the airstrikes.

Israel and Iran opened a new chapter in their long history of conflict when Israel launched a major attack with strikes early Friday that set off explosions in the Iranian capital of Tehran. Israel said it targeted nuclear and military facilities,