In 60 Seconds: in Mexico forensic proof rules out students

MEXICO: Forensic evidence from Argentina has shown that human remains discovered in burial sites Guerrero state do not belong to the 43 missing students. COLOMBIA: Members of the marcha patriotica party say that paramilitaries are plotting to assassinate guerrilla leaders during peace talks in Havana, Cuba. UNITED STATES: Missouri govern threatens to deploy national guard. CHINA: U.S. President Barack Obama met with Chinese head of state Xi Jinping on Wednesday.