Thousands of people from a 4,000-strong migrant caravan that has been crossing southern Mexico by foot since Christmas Eve dispersed on Tuesday as they boarded buses to processing centers where they are expected to apply for travel permits today. Buses provided by Mexican immigration authorities took the migrants to facilities in Huixtla, just 25 miles (41 km) north of the southern city of Tapachula near the Guatemalan border. After migrants apply for a travel permit, Mexican authorities may pro