US President Joe Biden is 'deeply concerned' about the release of classified documents on Israel's preparation for a potential retaliatory attack on Iran, according to White House National Security Council spokesman John Kirby. The US is still investigating how the Pentagon documents were leaked into the public domain. The leak has not impacted plans for an attack against Iran, according to a US official. The documents, which have not been authenticated, describe US interpretations of Israeli Air Force and Navy planning based on satellite imagery from October 15-16.