Air defense systems were activated in Tehran and other areas of Iran on Monday morning as the Israeli army claimed carrying out strikes on "military targets."

U.S. President Donald Trump said the U.S. carried out a "successful" bombing attack on three nuclear sites in Iran and they have been "obliterated." The extent of the damage is yet to be ascertained.

UN Secretary-General Antonio Guterres told the Security Council on Sunday that the bombing of Iranian nuclear facilities by the U.S. marked a "perilous turn."

Israel has "moved closer" to its goals in Iran after Trump ordered overnight bombing of Iranian nuclear sites, Israeli Prime Minister Benjamin Netanyahu said Sunday.

Iranian Foreign Minister Abbas Araghchi has arrived in Moscow and he will hold consultations with Russian President Vladimir Putin on Monday on the latest situation.

(With input from Reuters)