Four members of a drug caravan were killed and four bags containing methamphetamine seized in a gun battle with border patrol police along the Thai-Myanmar border in Chiang Mai’s Chiang Dao district on Tuesday morning. A team from the 335th border patrol unit based in Chiang Dao spotted about 10 armed men carrying bags suspected to contain illegal drugs close to the border with Myanmar near Ban Denyakhad village in tambon Muang Na in Chiang Dao district on Tuesday morning