Five from China face deportation, following a UK Border Agency raid on the Summer Palace restaurant in Saundersfoot.

Acting on a tip off, officers from the agency went to the premises on High Street, last week.

The resturant's 42-year-old chef was found to be a failed asylum seeker who had not left the UK as required when his claim for protection was turned down.

A 23-year-old waiter and 26-year-old cook were found to have entered the country illegally.

A 28-year-old woman working there was found to be doing so in breach of the conditions of her student visa.

When officers carried out a search of attached accommodation, a fifth offender was found – a 24-year-old man who had failed to leave the UK once his asylum claim was turned down.

He remains in immigration detention pending his removal from the UK while the other offenders must report to a local police station while steps are taken to remove them from the UK.

Summer Palace was served with a civil penalty notice, which could total up to £40,000 for employing the four offenders seen working.

If employers are unable to provide evidence that legally-required checks were carried out before giving the workers jobs, a fine of up to £10,000 for each offender is imposed.

Damian Green, the Immigration Minister, said that the UK Border Agency was carrying out “an intense period of enforcement activity” over the summer.

Jane Farleigh, Regional Director of the UK Border Agency in Wales and the South West, added: “This successful operation shows that our officers will find immigration offenders wherever they are across Pembrokeshire and we carry out frequent operations to track them down.”

Advice for employers about how to employ migrant workers legally is available from the UK Border Agency on http://www.ukba.homeoffice.gov.uk/employers/ Anyone who has information on immigration offenders in Wales can phone the UK Border Agency on 029 2092 4727