Officials in Mexico’s Chiapas state postponed classes Friday for more than 1 million students in an effort to avoid a resurgence of H1N1 flu, which has sickened thousands throughout Mexico this year. Chiapas Education Secretary Javier Alvarez Ramos and state Health Secretary James Gomez Montes said classes will start August 31 for middle and high school students and September 7 for elementary pupils, the state-run Notimex news agency said.