More than 100 classified documents detailing U.S. national security secrets have been leaked on social media, alarming the Pentagon and adding turmoil to a situation that seemed to have caught the Biden administration off guard. Analysts say more than 100 documents may have been obtained from within U.S. military and intelligence agencies, and a senior intelligence official called it “a nightmare” that could be hugely damaging due to its scale and sensitivity of the documents themselves.