Spencer Platt / Getty Images
March 22, 2010
A crime investigation unit looks for evidence at the scene of a slaying in Ciudad Juárez. The border city has been racked by violent drug-related crime and has quickly become one of the most dangerous cities in the world. As drug cartels have been fighting over ever lucrative drug corridors along the United States border, the murder rate in Juárez has risen to 173 slayings for every 100,000 residents.