Six Algerian men, all suspected of being illegal immigrants, were arrested in a major police operation in Oxford on June 3.
In a simultaneous swoop, more than 60 officers raided one address in Mark Road, Headington, and another in Lyndworth Mews, at the Headington roundabout, shortly after 6am.
The men were all taken to St Aldate's police station, where officers were assisting Immigration Service officials in questioning the men.
They are suspected of using forged documents to obtain entry into the UK.
Specially trained officers searched both addresses, along with evidence-gathering teams.
A spokesman for Oxford police said the operation had been completed within an hour.
She said: "We have 24 hours to question them. If they are found to be here illegally, they will be deported."
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