Authorities in Hanoi temporarily shut two gas stations Thursday after allegedly finding them using hi-tech tricks to cheat customers.
On the morning of that day officials made surprise checks at the two gas stations in Hai Ba Trung and Gia Lam Districts and discovered an electronic chip attached to each of their pumps.
The chips, controlled from a distance by some of the pump attendants, reduced the gasoline pumped into a vehicle by around 5 percent, authorities said.
Investigations are continuing.
Earlier in October authorities in Ho Chi Minh City revoked the license of a gas station in District 1 for tampering with its meters to cheat customers.
Authorities started investigating after Thanh Nien revealed the fraud in September. Its owner admitted to the violations and had to pay a fine of VND96 million, or around US$4,300.