A Battle restaurant was raided following a tip off from a member of the public that illegal workers were employed at the business.
Home Office Immigration Enforcement officers visited Bonani, in the High Street, on Thursday, June 18.
Staff were questioned in relation to their immigration status.
A 25-year-old Bangladeshi man was arrested for working illegally.
He is now detained, pending removal from the country.
The tandoori restaurant has been warned it could face a financial penalty.
Bonani was served a notice warning that a financial penalty of up to £20,000 will be imposed unless proof is provided that legally required right to work checks were carried out, such as seeing a passport or a Home Office document.
Assistant director Richard Lederle, from Home Office Immigration Enforcement, said: “People who are living and working in the UK illegally will be arrested and removed from the country, and we will take the strongest possible action against employers who try to cheat the system.
“Illegal working is not a victimless crime.
“Not only does it defraud the taxpayer, it also denies opportunities to legitimate job seekers and undercuts businesses who play by the rules.
“I would urge people with detailed and specific information about suspected immigration abuse to contact us.”
Anyone with information about immigration crime can contact https://www.gov.uk/report-immigration-crime
Alternatively, call Crimestoppers anonymously on 0800 555 111.
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