White House national security spokesman John Kirby says President Joe Biden is “deeply concerned" about the unauthorized release of classified documents on Israel’s preparation for a potential retaliatory attack on Iran.

President Joe Biden is "deeply concerned" about a leak of classified documents that contain the US's assessment of Israeli plans to attack Iran, White House National Security Council spokesman John Kirby said. Officials have not determined whether the documents were released due to a hack or a leak, Mr Kirby said.