Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Global Trafficking Networks Behind British Migrant Tragedy Henry Ridgwell LONDON - British and Belgian police are continuing their investigations into the people-smuggling networks that transported 39 migrants who were found dead in the back of a refrigerated truck near London on October 23. Suffocation is the suspected cause of the migrants' deaths in the sealed container. Many of the victims are believed to be Vietnamese and appeared to have traveled across the border to China and into Russia and Europe, before crossing the English Channel from the Belgian port of Zeebrugge to Purfleet on the River Thames. The truck was reportedly registered in Bulgaria. The driver, 25-year-old Maurice Robinson from Northern Ireland, has been charged with manslaughter, people trafficking and money laundering. Police are seeking two brothers in the deaths -- 40-year-old Ronan Hughes and 34-year-old Christopher Hughes, also from Northern Ireland. The migrants' journey reportedly began 9,000 kilometers away in the remote Nghe An and Hanoi provinces in northern Vietnam. On the doorstep of a family home in the village of Ha Tinh, Bui Phan Chinh comforted his grandson as they waited for further news. Chinh believes his son, -- the boy's father, Bui Phan Thang -- was among the victims. "Many people in this village have gone abroad to work, so my son wanted to go abroad like others to earn money," Chinh explained. "No one could imagine that he ended his life there forever, leaving behind his wife and the young kids." .