Mexican President Andrés Manuel López Obrador says the United States is partially responsible for a wave of violence in the state of Sinaloa that has left dozens dead in the past two weeks, with bodies repeatedly found on public streets and highways.

Mexican President Andrés Manuel López Obrador has blamed the United States in part for the surge in cartel violence terrorizing the northern state of Sinaloa which has left at least 30 people dead in the past week.

National Guards and Army forces patrol the streets during an operation in a neighborhood of Culiacan, Sinaloa state, Mexico on Sept 19. (AP)

Two warring factions of the Sinaloa cartel appear to be fighting for power since two of its leaders were arrested in the U.S.