A recent report by Bandeirantes TV explores how the Brazilian military police are trying to retake the "favelas" in Rio de Janeiro.
Known as the Peaceful Police Units (UPP), the units have mapped out the areas where criminals sell drugs, traffic supplies and have their safe houses. They then place their units on strategically located hillsides where they station several dozen police who maintain a permanent presence in the area.
Police and military have battled with criminal groups all week in the city, leaving 23 dead and numerous buses and cars destroyed.
Watch the full video below.