The police in the northern city of Hai Phong said Friday they have arrested a man found trafficking three "heroin bricks" weighing one kilogram in total.
Pham Van Kien, 29, was caught red-handed transporting the heroin from the port city to Lai Chau and Lao Cai provinces on his motorbike on November 10, the police said.
They said Kien and his wife, Dao Thi Thanh, belong to a trans-provincial heroin trading ring.
Further investigation is ongoing into the case.
Vietnam has some of the world's toughest drug laws. Trafficking more than 600 grams of heroin in the country is punishable by death.