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.

WASHINGTON (NEXSTAR) – The U.S. is investigating how classified documents ended up on the social media app “Telegram” Friday. They show Israel’s potential plans to attack Iran in retaliation for its missile attack Oct.1. “Certainly, we are concerned,” White House Press Secretary Karine Jean-Pierre said.

The damage to national security appears to be limited in scope, though the assessment is still ongoing, according to a U.S. official.