Mexican President Felipe Calderon has called for the United States to share responsibility in the battle against drug traffickers in the two countries. His comments came on a one-day visit to the border city of Ciudad Juarez, where three people connected to the US consulate were killed on Saturday. Hundreds of demonstrators greeted Mr Calderon demanding the withdrawal of Mexican troops from the town. Meanwhile, Texas has increased border patrols in the wake of the violence. “The violence is a problem for both nations, one that has its origin in the consumption of drugs in the US and the criminality associated with trafficking,” Mr Calderon said during his visit.