Traffic in both directions was suspended at the San Ysidro port of entry between San Diego and Tijuana, the busiest land border in the Western Hemisphere, the U.S. Customs and Border Protection agency said on Twitter. Mexican police, some wielding shields, scattered migrants and protesters, many of whom rushed toward the U.S. border. U.S. Customs and Border Protection officers repelled them with a volley of canisters emitting large clouds of gas as U.S. and Mexican government helicopters clattered overhead.
