A series of raids have been carried out, including in Birmingham, in a bid to crack down on a scam where immigrants are brought to the UK as ministers of religion and then vanish.
Sixteen addresses across the country were targeted in early morning swoops as part of an ongoing investigation into the Khalsa Missionary Society in Manchester.
It is claimed that immigrants are brought from India to live in the UK as religious workers but then disappear.
Raids were carried out in Birmingham, Slough, Southall, Southampton, Luton, Hounslow, and Leicester.
A Home Office spokesman said:
"This is a large scale operation linked to suspected immigration crime targeting several locations across the UK."
Raids have been carried out in Leicester in a bid to crack down on an immigration scam.
The scam works by bringing immigrants to the UK from India as ministers of religion, only for them to vanish, according to the Press Association.
Among the 16 early morning raids were addresses in Leicester and Birmingham, as part of an ongoing investigation into the Khalsa Missionary Society in Manchester.
In September, 17 people were arrested as part of the same operation, including some from Wolverhampton.
Human Trafficking Centre officials and West Midlands Police officers raided a Walsall property today, following tip-offs that it was being used to house slave labour immigrants.
The Wednesbury Road address was raided at 6:30am in response to information that eastern European immigrants were being held against their will and forced into begging and criminality.
A 37-year-old Romanian man was arrested on suspicion of human trafficking, whilst another man, a woman and three children are being cared for by Red Cross officials.
Since 2009, over 1,000 men, women and children have been referred to the centre as potential victims of trafficking.
Protestors against immigration have marched through Spalding today. It follows a similar protest in Boston earlier this year.
Protesters against immigration are planning a march through Spalding today.
Organisers say they are expecting hundreds of supporters to join the protest which will take place in the town's market place.
It follows a similar protest in Boston last year.
Illegal immigrants have injured five officers during a riot at a detention centre in Lincolnshire, according to border officials.
Up to 40 detainees were involved in the incident at Morton Hall immigration removal centre in Swinderby, Lincolnshire, which saw one detainee taken to hospital and led to 12 others being transferred to other centres.
Staff were injured on December 30, the UK Border Agency said, while up to 50 detainees were also involved in a protest on Christmas Day, in which no-one was injured.
Both incidents, at the former women's prison. were brought under control within an hour.
Morton Hall was opened as an immigration removal centre in 2011. It holds up to 392 foreign national offenders, failed asylum seekers and illegal immigrants.
In September last year, 18 asylum seekers went on hunger strike at Morton Hall because they did not want to be sent back to Afghanistan.
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