A woman was arrested in Quang Ninh Province on Friday for allegedly smuggling five kilograms of drug to Hanoi.
Nguyen Thi Thuy Linh was arrested by a combined force of customs and police officers on while she was taking a bus to Hanoi, according to Quang Ninh customs.
The drug was put in 16 plastic bags being hidden in a wall clock, they said.
Linh confessed that she was paid VND20 million (US$94) to traffic the drug, which had been brought into Vietnam from Guangzhou in China through Mong Cai, a town bordering China in Quang Ninh.
Police are investigating the case.
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 methamphetamine face the death penalty.
The production or sale of 100 grams of heroin or 300 grams of other illegal narcotics is also punishable by death.