US troops at Mexico Border Post. AFP

The United States closed a border crossing in southern California on Sunday after hundreds of migrants tried to breach a border fence from the Mexican city of Tijuana, US authorities has announced.

The US Customs and Border Protection office in San Diego, California, said on Twitter that it had closed both north and south access to vehicle traffic at the San Ysidro border post, before also suspending pedestrian crossings.

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Video clips posted on Twitter showed large numbers of migrants dashing across a shallow concrete waterway toward the border.

US agents fired tear gas at the migrants that climbed over a fence and attempted to rush the border from Tijuana, Mexico into the United States.

The shutdown took place only three days after Trump threatened to close the “whole border” with Mexico if “it gets to a level where we’re going to lose control or people are going to start getting hurt.”