(UPDATE) HANOI — Police in Vietnam busted the country's biggest synthetic drug factory, seizing 1.4 tons of ketamine in the coastal tourist city of Nha Trang, the government said. Policemen try to prevent drug addicts from escaping a compulsory rehabilitation centre in the southern province of Dong Nai on November 7, 2016. Police fired tear gas at dozens of drug addicts trying to escape from a compulsory rehab centre in Vietnam on November 7, just weeks after another mass breakout from the same facility. (Photo by AFP) A six-month operation to uncover the drug ring culminated last Saturday when 200…