Police have swooped on suspected people-smuggling gangs during raids in Birmingham and Smethwick.
Officers from the UK Border Agency (UKBA) carried out raids simultaneously in the West Midlands, as well as London, Hampshire,
Peterborough, Coventry, Leamington Spa and Stoke-on-Trent.
Warrants were also executed in Manchester, Sheffield, Lancashire and Glasgow, as well as France and Belgium.
UKBA officers raided 35 addresses in the UK and 40 on the Continent.
They were targeting gangs who bring illegal immigrants into the country in the back of lorries through Channel ports.
The stowaways pay between £2,000 – £6,000 per person to be smuggled into Britain.
More than 150 officers from the UKBA took part in the operation.
It is understood many of the immigrants who pay the gangs are from Iraq, Iran and Afghanistan.
So far, officers have made 20 arrests in relation to their investigation and another six in relation to other suspected offences including immigration breaches.