US closes major crossing as caravan migrants mass at border in Mexico

US closes major crossing as caravan migrants mass at border in Mexico  Washington Post Mexico to up security at border after migrants try to cross  Yahoo News US fires tear gas into Mexico to repel migrants, closes border gate for several hours  Reuters Caravan marches toward US border in show of force  10News Migrants overwhelm Tijuana; mayor declares humanitarian crisis  Mexico News DailyFull coverage