Colombia arrested a soon-to-be congressman from the Marxist FARC party on charges of drug trafficking on Monday, the government said. The detention of Seusis Hernandez sparked outrage from the former rebel group that demobilized last year. Hernandez, who was due to take office in July, conspired to export 10 tons of cocaine worth $320 million in street value to the US, Attorney General Nestor Humberto Martinez said in a televised address with President Juan Manuel Santos. A US grand jury in the Southern District of New York indicted Hernandez, known by his nom de guerre, Jesus Santrich, and three others last week, Reuters quoted Martinez as saying.