Ayatollah Ali Khamenei warns Israel and the U.S. of 'a crushing response' over attacks on Iran and its allies as regional tensions rise.

Iranian officials threatened that the country could use more powerful warheads in a retaliation against Israel, in an attack that may come as early as the day after the U.S. election.

Iran plans a more destructive offensive against Israel after recent Israeli strikes on Iranian military facilities. Iran may use missiles with more powerful warheads and involve conventional forces. Senior Iranian officials have indicated the possibility of producing nuclear weapons if faced with an existential threat.