Eight Malaysian and Chinese nationals found working illegally at restaurants and a takeaway in a Gwynedd town have been arrested.
The three premises are next door to each other in Caernarfon
The Thai Emperor, Everyday Takeaway and Honour Chinese restaurants in Caernarfon were visited by a Border and Immigration Agency team and police.
Six of those arrested, who had such jobs as cooking and serving customers, are due to be removed from the UK.
The owner of all three premises was given a formal written warning.
He will also face future visits by immigration officers, said the agency.
The operation on Wednesday evening followed intelligence.
Officers went into all three places at the same time and checked the documents of staff to discover if they had the right to work in the UK.
At Thai Emperor, a Malaysian man, 34, and woman, 31, were arrested and are due to be removed from the UK in the coming days.
Next door, in Everyday Takeaway, a Malaysian man, 32, was arrested and is also due to be removed.
Five illegal workers were arrested at the Honour Chinese restaurant, in Castle Square, including two Chinese men, aged 29 and 33, who were both failed asylum seekers.
Steps are being taken to remove them from the UK as soon as possible, said the agency.
Two Malaysian women, aged 24 and 29, and a 39-year-old Malaysian man will be removed from the UK in the coming days.
Another Chinese man arrested was later released after producing evidence he was working legally.
All those arrested were taken to Caernarfon and St Asaph police stations for questioning.
Jane Farleigh, regional director of the Border and Immigration Agency in Wales and the South West said: "This successful operation shows that we will find and arrest illegal workers wherever they are in Wales."
She added: "Illegal working hurts good business, undercuts legal workers and law-abiding businesses, creates illegal profits and puts those employed at risk."