Nine illegal Vietnamese immigrants have been caught working in beauty salons in the west of Scotland.
The UK Border Agency (UKBA) raided USA Nail Bar in Dumbarton Road, Glasgow, and USA Nail and Beauty in Alexander Street, Clydebank, on Saturday.
It said five illegal workers were identified in Glasgow with a further four in Clydebank.
Both businesses have been issued with a civil penalty notice for employing the illegal workers.
If they are unable to provide evidence that legally required checks - such as asking for a passport or a Home Office document - were not carried out, they may be liable for a fine of up to £10,000 for each employee.
The UKBA said it was carrying out further checks on the Vietnamese "with regard to removing them from the UK".
Phil Taylor, regional director of the UK Border Agency in Scotland and Northern Ireland, said: "We will not tolerate illegal working which threatens to damage our communities - it undercuts wages and exploits vulnerable workers.'Ongoing clamp-down'
"The UK Border Agency will act on intelligence to target those businesses which ignore the rules and remove those with no right to be in the UK.
"This operation is part of an ongoing clamp down on illegal working in Scotland to reduce the attractiveness of the UK to illegal immigrants."
The latest incident brings the number of illegal workers detained in Scotland since the beginning of November to at least 21.
Six Indian men were held after UKBA officers - acting on intelligence received - targeted the Beveridge Park Hotel in Kirkcaldy on 3 November.
A week later, two Pakistani men were detained in an operation at the Porto Ricos takeaway in Port Elphinstone, Aberdeenshire. The border agency said it was the second time illegal workers had been found there in less than three months.
And an Aberdeenshire restaurant is facing a fine after four Bangladeshi men aged between 29 and 43 were found to be working illegally at the Spice Cottage Restaurant in South Road, Oldmeldrum, on 9 December.