Riot police on guard as migrants make a dash towards the northern border of Mexico.
U.S. authorities have stopped all north- and south-bound traffic at the San Ysidro border point of entry between San Diego and Tijuana, Mexico, after migrants tried to rush the border Sunday.
More than 500 men, women and children overwhelmed Mexican police blockades, prompting U.S. agents to fire tear gas as U.S. Border Patrol helicopters flew overhead.
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