Thirteen people are dead after a brutally violent two days in Juarez, Mexico on Saturday (July 18). The drug war killed more than 6,000 people across Mexico in 2008 and 2,500 people so far this year. It is President Felipe Calderon’s biggest challenge and the violence has started to spill over some parts of the U.S. border. U.S. President Barack Obama praised Calderon’s campaign in a visit to Mexico in April and U.S. officials say escalating violence is a sign of drug gangs’ weakness.