Calling for an end to the drug war, a coalition of peace activists arrived in the United States on Sunday to start a month-long trip across more than 20 U.S. cities.

More than 200 people gathered at a park on the U.S.-Mexico border in San Diego, California, as part of a movement known as the "Caravan for Peace with Justice and Dignity" that includes nearly 100 organizations.

The effort is led by Mexican peace activist Javier Sicilia, whose son was killed by drug gang members last year. Sicilia and others want to draw attention to what they say are misguided anti-drug policies in both the U.S. and Mexico. They estimate that tens of thousands of lives in Mexico have been lost because of the war on drugs.

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