A 34-year old woman from Luton was arrested this week on suspicion of smuggling illegal immigrants into the UK.
A warrant were carried out after a number of people, mainly Albanians, were detained by immigration services and police over the past few months.
The woman was arrested under section 25 of the Immigration Act 1971 on Wednesday, July 8.
Two men, aged 32 and 20, were also arrested in Finchley in north London, and Greenford in west London, as further warrants were carried out this week.
All three are alleged to be involved in the illegal entry of non-EU citizens into the UK. They have been bailed until September pending further inquiries.
A café in Finchley was also searched.
The operation was carried out by officers from the Eastern Region Special Operations Unit (ERSOU) supported by the National Crime Agency.