Avon and Somerset police have released a 50-year-old man on bail following his arrest in connection with a lorry carrying 15 people near Ilminster.
ITV News understands he is the driver of the lorry.
A force spokesman said: "A 50-year-old man has been released on police bail pending further enquiries. He was arrested yesterday on suspicion of facilitating entry of people into the UK. 15 people who were found in the back of a lorry remain in a rest centre."
More top news
Those who wear face veils in public are liable to a £664 fine and a suspension of social benefits.
The extent of last winter's floods has been revealed after a survey by the Local Government Association
Jackie Walker, vice-chair of the pro-Corbyn group Momentum, was suspended over comments shown on a leaked video.