UK Border Agency operation also targets addresses in Hayes, Harrow, Southall and Park Royal
Eight men are being held after immigration officers raided addresses across London including Brent in a crackdown on suspected visa fraud.
The UK Border Agency teamed up with the police to carry out the dawn raids in Kilburn, Kingsbury, Hayes, Harrow and Southall as part of an investigation into an immigration scam operating in the city.
Three men age 31, 32 and 35, were arrested at an address in Church Lane, Kingsbury, a 30-year-old was held at a property in Mortimer Crescent, Kilburn, and the four remaining men were detained at three separate addresses outside the borough.
UKBA officers also stormed four business premises in Park Royal and Harrow, two of which are the offices of immigration law advisors.
The arrests are the culmination of a year-long probe into a criminal network suspected of helping hundreds of clients to fraudulently apply for UK visas.
A majority of applicants, who were charged thousands of pounds, are from India, Pakistan and Nepal.
The arrested men, of which seven are British and one Indian, are being questioned at a police station.
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