Police in northern Vietnam have arrested a businessman for making and selling hundreds of fake negative Covid-19 test certificates, as the Southeast Asian country battles its worst outbreak yet, reports Reuters.

Tran Tuan Duong, who runs a printing business in Bac Ninh province, was arrested while selling six certificates to a client for one million dong ($43.86), the provincial police department said.

Duong, 34, confessed to police that he had sold around 150 such documents, including ones for swab-based polymerase chain reaction (PCR) tests, according to a police statement, which said further investigation was under way.