More than half of the roughly 1,300 migrants later returned to the Siglo XXI facility in the border city of Tapachula in Chiapas state, but about 600 are still unaccounted for, the National Migration Institute said in a statement. Migrants from Cuba, who make up the majority of the people being held at the center, were largely behind the breakout, the institute added. Mexican newspaper Reforma reported ["Huyen migrantes de estación en Chiapas" A/V, ES] that Haitians and Central Americans were also among those who fled ...