Mexican President Felipe Calderon has called for the United States to share responsibility in the battle against drug traffickers in the two countries.<br/><br/>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. Mr Calderon, was accompanied by the US ambassador to Mexico, Carlos Pascual on his third visit this year to Ciudad Juarez, which has earned a reputation as one of the most violent cities in the world. <br/><br/>On arrival, hundreds of demonstrators greeted Mr Calderon demanding the withdrawal of Mexican troops from the town. The protesters have accused Mr Calderon of provoking more violence between rival drug gangs by bringing in the army to try to crack down on the problem. Meanwhile, Texas has increased border patrols in the wake of the violence.