Sao Paulo could face gang war with truce collapse - Article Photos 5/6

Mounted military police patrol in the Paraisopolis slum of Sao Paulo, Brazil, early Tuesday, Nov. 13, 2012. At least 140 people have been murdered in South America's biggest city over the past two weeks in a rising wave of violence, Sao Paulo's Public Safety Department said on Sunday. (AP Photo/Andre Penner)