Police in the north-central province of Quang Tri have said they arrested three men who had allegedly been trafficking heroin from Laos for a long time.
After 10 months of surveillance, they caught Nguyen Trung Hieu, 22, and Le Xuan Duong, 24, near the Lao Bao border gate in late September with nearly one kilogram of marijuana and 579 synthetic heroin tablets.
Another gang member, Nguyen Minh Quoc, 24, was arrested later in Dong Ha, the province capital.
The police said they had been observing the gangsters who went to Laos to buy heroin and returned with the drug hidden in milk boxes.
At the border they would climb on top of the bus to stash away the milk boxes. They would pick up the boxes if the bus went through safely, but would pretend to have nothing to do with them if they were discovered.
Drug trafficking from Laos to Vietnam has been rampant, with many arrests being made this year.
The Lao police earlier this month arrested a couple who planned to carry around 116 kilograms of heroin into Vietnam.
Between April and early September police busted at least six trafficking operations, arresting several Laotians and Vietnamese and seizing dozens of kilograms of heroin.
The arrested gangsters confessed they had trafficked hundreds of kilograms for years from Laos to Vietnam, sometimes even to China.
Vietnam has some of the world's toughest drug laws. Those convicted of smuggling more than 600 grams of heroin or more than 2.5 kilograms of meth face the death penalty.
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