The Ho Chi Minh City police is set to begin a door-to-door campaign to warn the public and businesses about a Taiwanese con gang that has swindled over VND20 billion (US$949,000) so far.
They discovered that the Taiwanese, together with some locals, called people using internet phones and, masquerading as law enforcement officials, told them they were under investigation for money laundering or drug trafficking.
They would then tell the victims to transfer money to bank accounts they provided, saying it was for investigating the origin of the amount.
They transferred the money to several other accounts and withdrew it using international debit cards.
Hundreds of people have been cheated, most of them in HCMC.
The police have been investigating the scam since January and arrested 42 people, including 10 Taiwanese.
They have also seized several credit cards, blocked more than 400 bank accounts, and returned more than VND5 billion to victims.