UK Border Agency officials raided several homes in north and central London at dawn .
Four males and one female aged 23, 23, 29, 38 and 56 were detained in Mill Hill, a 44-year-old man was arrested in Edgware and another 46, was picked up in Kensington.
All were arrested on suspicion of conspiring to facilitate an asylum seeker for gain and are now being questioned at police stations in London.
This followed a joint investigation with the Spanish Guardia Civil into an alleged criminal network suspected of assisting Iranian migrants into the UK from Europe.
The network is alleged to have organised travel and provided false documents to their clients to facilitate their arrival at UK airports.
Co-ordinated action by the Guardia Civil saw eleven people arrested during raids in Madrid and Alicante in Spain.