COLOMBIA - FARC demands an end to military operations in area where they are planning to release a captured General. MEXICO - 6 new mass graves found as crews search for 43 missing students. VENEZUELA - The United Socialist Party held primaries on Sunday with record turnout. UNITED STATES - Tensions in Ferguson, Missouri continue to mount ahead of the grand jury's decision regarding the shooting death of an unarmed black teenager by police. UNITED STATES - Secretary of Defense Chuck Hagel steps down, after coming under criticism for the failure of the U.S strategy in the Middle East.