Two Vietnamese men were sentenced to 15 months in prison at the Shatin Magistrates’ Court on Wednesday for working illegally.

During an Immigration Department operation named “Twilight” on Monday, investigators raided a restaurant in Fanling in the New Territories and arrested two Vietnamese men, aged 40 and 47, who were working as dishwashers, according to a government release.

An employer suspected of hiring the illegal workers was also arrested and the investigation is ongoing. The two Vietnamese men were charged with illegally entering Hong Kong and working illegally. One of the defendants was charged with one count of using a forged identity card.

The two men were sentenced to 15 months in jail.

Meanwhile, the immigration department mounted a territory-wide anti-illegal worker operation from Monday to Thursday and raided 39 locations in the city. They arrested 22 illegal workers, seven men and 15 women aged 28 to 52, and nine employers.

The illegal workers were found in various locations, including a car park, a clinic, companies, construction sites, a home for the elderly, a fish market, a flower shop, a garbage collect point, a hostel, industrial buildings, massage parlors, restaurants, salons, a shop and warehouses.