Police have seized nearly 200 kg (440 lb) of ivory in a raid of the residence of a smuggling suspect in Hanoi on Sunday afternoon.
The raid was carried out after the police identified Phan Trong Kien, 35, as a member of a large scale ivory smuggling ring, a representative of the national anti-smuggling police agency said.
Early the same day the police caught a group of customers who had bought 15 kg of ivory from Kien, the representative said.
Kien told the police he had bought the Africa-origined tusks at about VND8 million (US$358) per kilo and resold them at between VND10 million and VND20 million.
Zing news website quoted a police source as saying that Kien was known as a major supplier of wildlife for restaurants in Hanoi.
The police are investigating further.
Vietnam has banned ivory trade since the 1990s, and yet it has been fueled by the rising affluence in recent years and the demand for using ivories for decoration.