Four illegal workers from Bangladesh have been arrested at The Silk Road Restaurant and Bar in Central Milton Keynes.
The restaurant, which recently received a zero star food hygiene rating, now faces fines of up to £50,000 after the operation by Home Office immigration enforcement officers this week.
At 6.25pm on Wednesday the four individuals were questioned to check if they had the right to be in the UK.
Four men were arrested – the first, aged 25, was found to have overstayed his visas, while two others, aged 27 and 40, had entered the country illegally, and a 29-year-old man was working in breach of his visa conditions.
A 38-year-old man found working at the restaurant had also overstayed his visa but was not arrested.
The men aged 27 and 29 were transferred to immigration detention pending removal from the country. The other two have been placed on immigration bail while their cases are progressed and will also face removal from the country if found to have no leave to remain.
The business, in Grafton Gate, was served a notice warning that a civil penalty of up to £10,000 per illegal worker found will be imposed unless proof is provided that the correct right-to-work checks were carried out, which is a potential total of a £50,000 fine.
Paul Smith, from the Thames Valley and Surrey Home Office Immigration Enforcement team, said: “Our teams carry out visits like this in Buckinghamshire almost every day, with more planned in the future.
“Illegal working has a serious impact on communities, undermining legitimate businesses and taking jobs from those who are genuinely allowed to work.
“We are happy to work with businesses to let them know what checks need to be made on staff, but those who break the law should know that they will face financial penalties.
“I would urge members of the public with information about suspected immigration abuse to get in touch.”