U.S. President Joe Biden has signaled "tacit approval and explicit support for Israel's unlawful military aggression against Iran," Iran's mission to the United Nations said on Monday, citing remarks by Biden in Germany last week.

The U.S. is investigating an unauthorized release of classified documents that assess Israel's potential plans to attack Iran.

President Biden is "deeply concerned" by the possible leak of U.S. intelligence documents regarding Israeli preparations for an attack on Iran, spokesman John Kirby said Monday.

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.

Israel plans to strike Iran in retaliation for a ballistic missile attack this month. Iranians fear the response will destabilize the economy and stir unrest.

Iran's envoy to the U.N. accused President Biden of a "dangerous provocation" in saying he knew of Israel's plans to strike.

Iran shot off a scathing letter to the UN after U.S. President Joe Biden's controversial remarks on Israel's plans to retaliate to Tehran's ballistic missile attack. Iran's mission to the UN said that the U.