2014/09/03 Headlines: Ukraine Retracts Ceasefire Claim; U.N. Says Displaced Top 1 Million; Islamic State Beheads 2nd U.S. Journalist in New Video; Obama Sends 350 More Troops to Iraq; Pentagon: 6 Killed in Somalia Drone Strike; U.N., Aid Groups Seek Stepped-Up Global Response to Ebola Outbreak; Halliburton to Pay $1.1 Billion Fine for 2010 Gulf Oil Spill; DNA Tests Clear Wrongfully Convicted Half-Brothers After 30 Years