Overview: 2011/09/15 Headlines: U.S. Envoy, International Leaders Visit Libya; Mass Graves Uncovered; Syrians Mark 6 Months of Sustained Protests; 19 Killed in Iraq Bombings; U.S. Blames Haqqani for Kabul Attack; Warren Confirms U.S. Senate Bid in Massachusetts; Obama Admin Questioned on Backing of Failed Solar Firm; Gov't Report Cites New BP Infractions Before Gulf Spill; Texas Urged to Halt Execution over Racially Biased Witness; California to Release Thousands of Female Prisoners; U.S. Urges Sri Lanka to Address War Crimes Findings; Ex-Chief of Colombian Secret Police Sentenced to 25 Years; Haitians Demand Ouster of U.N. Peacekeeping Force; FBI Teaches Anti-Muslim Content in Counterterrorism Training; ICC Urged to Probe Vatican for Sexual Abuse, Cover-Up