Two Chinese cargo ships were attacked and their crews murdered on a stretch of the Mekong River in far northern Thailand.

The Mekong River massacre occurred on the morning of 5 October 2011, when two Chinese cargo ships 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 both 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.