The Mekong River massacre occurred on the morning of 5 October 2011, when two Chinese cargo ships carrying millions of amphetamine pills were attacked on a stretch of the Mekong River in the Golden Triangle region on the borders of Myanmar (Burma) and Thailand. All 13 crew members on the two ships were killed and dumped in the river. It was the deadliest attack on Chinese nationals abroad in modern times. In response, China temporarily suspended shipping on the Mekong, and reached an agreement with Myanmar, Thailand and Laos to jointly patrol the river. The event was also the impetus for the Naypyidaw Declaration and other anti-drug cooperation efforts in the region. On 28 October 2011, Thai authorities arrested nine Pha Muang Task Force soldiers, who subsequently "disappeared from the justice system". Drug lord Naw Kham and three subordinates were eventually tried and executed by the Chinese government for their roles in the massacre.Excessive media coverage and live broadcast of the execution were seen in Myanmar as a Chinese attempt to frame the ethnic Shans and the Burmese for the drug problems; China had previously allowed drug traffickers like Pheung Kya-shin to roam free in China. Since the KMT retreated to Myanmar in the early 1950s, ethnic Chinese drug lords have set up a drug empire in the Golden Triangle, taking advantage of their global networks, which the natives lacked. Profits from the drug trade have allowed the Chinese to expand and replace the native populations. As a result, parts of northern Myanmar and the city of Mandalay have become effectively sinicized.