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KUNMING, Dec. 24 (Xinhua) -- The 89th Mekong River joint patrol led by China, Laos, Myanmar and Thailand was launched Tuesday in southwest China's Yunnan Province.

In a bid to safeguard the security and stability along the Mekong River, the four countries will carry out joint patrols, visits, inspections and safety publicity events during the four-day patrol, according to the Yunnan provincial public security department.

Cultural and sports activities, a joint meeting of commanders and a work meeting were held by the four sides in the city of Jinghong, Yunnan, before the patrol.

The joint patrols on the Mekong River started in December 2011 after a gang hijacked two cargo ships and killed 13 Chinese sailors on Oct. 5 that year.

The Mekong River, known as the Lancang River at the Chinese stretch, is a vital waterway for cross-border shipping among China, Laos, Myanmar, Thailand, Cambodia and Vietnam.