The information was given by Senior Lieutenant Tran Phuc Thinh, head of the provincial Environmental Board.
The eight tigers have been found dead after being rescued
The 17 tigers were on August 4 found being raised in the basements of two families in Yen Thanh District. All 17 tigers are adults, some weigh about 200kg.
The tigers were brought to Vietnam from Laos as cubs. The families built the basements specifically to keep the animals.
The tigers were then rescued by the local police and carried out to a nature reserve in Dien Chau District for health check-ups. However, eight of them were found dead.
The dead tigers were frozen in order to help with the investigation into their cause of death.