At least three of the 39 people found dead in a lorry trailer in Essex may have been from Vietnam.
The BBC knows of three Vietnamese people whose relatives are worried they may have been in the trailer.
Pham Thi Tra My has not been heard from since she sent urgent messages on Tuesday saying she could not breathe.
Pham Tri Tra My's brother said £30,000 had been paid to people smugglers (Copyright Family of Pham Tri Tra My)
Local police are teaming up with authorities in Vietnam after US$35m worth in cocaine was found aboard a ship which left this country about two months ago.