Police in the Mekong Delta province of Kien Giang said they are investigating a case in which people apparently presented a forged US$72,000 winning lottery ticket last month.
The incident happened at the Trieu Phat lottery agency owned by Ngo Xuong Phuc of Rach Gia City.
On the afternoon of July 22, Phuc was about to close his store when a woman named Nguyen Thi Tuyet, accompanied by four other people, showed up.
Nguyen Thanh Duoc, who introduced himself as Tuyet's son, produced a lottery ticket issued by the An Giang Province Lottery Company with the serial number 938368. The number had won the first prize of VND1.5 billion ($72,000) the previous day.
Tuyet asked Phuc to give her VND1.5 billion in cash, but when Phuc scanned the ticket he suspected it was fake.
When he returned the ticket to the guests, they screamed and accused him of switching the real ticket for a fake ticket.
Phuc called the police to the scene. The police later summoned the involved people for questioning.
According to Rach Gia City police, the ticket has the serial number of 738362, but it had been "copied and pasted" in such a way that it could be spotted with naked eyes.
They did not elaborate further on how the ticket was forged.
Lieutenant-Colonel Pham Chanh Cu, deputy chief of Rach Gia Police Department's Investigation Police Office, said the police had watched the video footage recording the process when the group produced the ticket to the lottery agent owner until the owner discovered the ticket was fake.
"The process was continuous, which means Phuc (the lottery agent owner) could not have had time to switch the ticket," he said.
Phan Buu Duong, chief of Rach Gia City Police Department, told Thanh Nien the police were investigating to find out who had forged the winning ticket.
The five people who claimed the prize money from the ticket agent have been placed under close scrutiny, he said.