More Vietnamese families have come forward with information their relatives may be among the 39 people found dead in the back of a container truck in southeastern England.
British police initially said they believed the victims were Chinese but acknowledged this was a "developing picture".
Police on Friday arrested three people on suspicion of manslaughter and conspiracy to traffic people. The 25-year-old driver of the truck remains in custody on suspicion of murder.
Nguyen Dinh Luong is a possible victim Source: Family handout via BBC
In Vietnam, the father of 20-year-old Nguyen Dinh Luong feared his son was among the dead.
He told The Associated Press he had not been able to reach him since last week, when he told his father he would join a group in Paris that was trying to reach England.
"He often called home but I haven't been able to reach him since the last time we talked last week," Nguyen Dinh Gia said.
"I told him that he could go to anywhere he wants as long as it's safe. He shouldn't worry about money, I'll take care of it."
Truck driver Mo Robinson has already pleaded guilty to manslaughter in connection with the 39 deaths. Source: AAP
He said his son left home in central Ha Tinh province to work in Russia in 2017, then on to Ukraine.
In April 2018, he arrived in Germany then travelled to France. He told his family that he wanted to go to the UK.
The Vietnamese Embassy in London said Friday that it contacted police about a missing woman feared to be one of the dead.
An embassy spokesman said it was contacted by a family in Vietnam who says their daughter had been missing since the truck was found.
The BBC reported it had been in contact with six Vietnamese families who feared their relatives are among the victims.
Pham Thi Tra My, 26, sent text messages to her family saying she could not breathe. Source: Supplied
Relatives of 26-year-old Pham Tra My told the broadcaster they had been unable to contact her since receiving a text Tuesday night saying she was suffocating.
"I'm so sorry mom and dad ... My journey abroad doesn't succeed," she wrote. "Mom, I love you and dad very much. I'm dying because I can't breathe .... Mom, I'm so sorry."
China said it could not yet confirm the victims' nationalities or identities.
The tragedy recalls the deaths of 58 Chinese migrants who suffocated in a truck in Dover, England, in 2000 after a perilous, months-long journey from China's southern Fujian province.
The container lorry where 39 people were found dead inside. Source: AAP
They were found stowed with a cargo of tomatoes after a ferry ride from Zeebrugge, the same Belgian port featured in the latest tragedy.
In February 2004, 21 Chinese migrants - also from Fujian - who were working as cockle-pickers in Britain drowned when they were caught by treacherous tides in Morecambe Bay in northwest England.
