 From 2007 through 2010, Tijuana experienced an unusually high level of violent crime related to gang violence, in part derived from the Mexican drug war and human trafficking.Homicides peaked in 2010, when 844 people were killed, compared with 355 in 2004 and 349 in the first eight months of 2011.Reportedly, the wave of violence resulted from a turf war as the administration of President Felipe Calderón weakened the local Arellano Félix cartel; violence slowed when the larger Sinaloa cartel took control.