Rio de Janeiro's military police announced its fifth change in command in seven years. The security institution has been plagued by challenges including controlling troops during 2013 street demonstrations.
Mexico's attorney general ended a press conference last week about the 43 missing students by declaring that exasperated line, fueling outrage at the government's handling of the case – and launching a new hashtag on social media, #YaMeCansé.
A recent Senate resolution calls on Bolivia's attorney general to suspend the 300 public prosecutors who have been formally accused of corruption or some other offense.
The search for 43 college students who vanished in the southern state of Guerrero, Mexico, has dragged on for more than a month. How the crisis is resolved will have a profound impact on confidence in President Peña Nieto.
Four new suspects in the case of 43 missing college students pointed Mexican authorities toward a mass grave this week. A month after the students' disappearance, families still have no answers.
Bolivia borders Brazil, the second biggest consumer of illegal drugs in the world; Peru, the world's top producer of cocaine; and Paraguay, South America's primary producer of marijuana.