Four people have been arrested amid dawn raids targeting an alleged people smuggling gang said to have advertised illegal crossings from France on social media.
Three Albanian men and a woman from Moldova were detained on suspicion of immigration offences as part of a National Crime Agency investigation into the group.
They are also suspected of picking up illegal migrants from HGV stops in Kent and taking them to London.
A 31-year-old man was arrested in Edmonton, north London, a 29-year-old man in Enfield and a 30-year-old man near Gatwick Airport on Wednesday.
The 33-year-old woman was arrested in Leyton.
