It has stirred up controversy in generating more hydropower by building dams on the Lancang River in Yunnan, which forms the upper reaches of the Mekong River. The PRC has also begun to extend its sphere of political influence in the GMS. When a Myanmarese drug lord massacred 13 PRC sailors on the Mekong River, the PRC worked closely with Myanmar and Lao PDR police to capture and later execute Naw Kham, the alleged mastermind.