The United States released dozens of so-called "high-risk" detainees from the Guantanamo Bay prison facility and held more than 150 innocent men for years, according to new reports about a trove of leaked military documents. The more than 700 classified military files, part of a massive cache of secret documents leaked to the whistle-blowing website WikiLeaks, were made available to select US and European media outlets and made public on Sunday.