ITV News understands the lorry carrying the 15 passengers belongs to a firm called Thermotraffic and that it stopped in Calais before reaching the UK.
ITV News producer Sandi Sidhu has tweeted:
I'm told that the lorry belongs to Thermotraffic came frm Europe and had stopped in Calais. It was supposed to be carrying general cargo
Police have said the vehicle "originated in mainland Europe" and that it "has been seized as part of our investigation".
More top news
The returns of Benedict Cumberbatch's detective and the X Factor judge were among 2014's most tweeted TV moments in a billion conversations.
A family has issued an appeal to help find their missing pet turkey - in case he gets gobbled up as someone's Christmas dinner.
The winner of X-Factor Ben Haenow has revealed how keen he is to have the Christmas number one.