Police continue to question four suspects in the deaths of 39 people whose bodies were found in a truck in Essex.
A man was detained at Stansted Airport on Friday on suspicion of murder and conspiracy of people traveling. [1
Arrests have come as efforts to eliminate and identify the dead continue. Police officers were observed at the home address of the arrested couple, a man and a woman who are both 38.
The man arrested at Stansted Airport is 48 years old and is from Northern Ireland.
Police were given extra time to question 25-year-old truck driver Mo Robinson from Armagh County.
The bodies of eight women and 31 men were found in a refrigerated trailer at Grace Industrial Park.
The trailer arrived in Purfleet on the River Thames from Zeebrugge, Belgium at 00:30 BST on Wednesday.
He left port shortly after 1:05 the same day and the bodies were discovered at Waterglade Industrial Park about 35 minutes later.
A number of people are believed to be from Vietnam, although initially the Essex police said the victims were Chinese nationals.
Families worried that their relatives were in the trailer contacted the BBC.
And VietHome, an organization that represents the Vietnamese community in the United Kingdom, said that after the truck was opened, it received photos of nearly 20 people who had disappeared.
The group said it began receiving reports of missing people Wednesday, the missing were between the ages of 15 and 45, she said.
The BBC has been talking to Pham Thi Tra My brother, 26, with whom he has not been heard since on Tuesday, sending text messages that he could not breathe.
"We ask the British police to assist in the investigation of
The last message received from Ms Tra My was at 22:30 BST on Tuesday – two hours before the trailer arrives at the Zeebrugge Purfleet terminal in Zeebrugge. Belgium  Her family shared texts that she sent to her parents, which translated: "I am really sorry, Mom and Dad, my trip to a foreign land has failed.
"I'm dying, I can't breathe, I love you so much Mom and Dad. I'm sorry, Mother."
Nguyen Din Luong's relatives, 20, also said they feared he was among the 39 victims .
The Vietnam Embassy in London has been in contact with Essex police since Thursday, spokesman
Chinese Ambassador to the United Kingdom Liu Xiaoming said China was taking "firm and effective measures against human trafficking".
He called on the international community to "step up cooperation in the fight against crime" of trafficking in human beings.
The Vietnamese risk everything to reach the United Kingdom
By Lucy Williamson BBC News, Northern France
An hour inside the French coast, a dozen Vietnamese men are breastfeeding tea over a campfire while waiting for a phone call from a man they call "boss", an Afghan who opens a trailer in the park, they say. to trucks nearby and shut them in.  Duc paid € 30,000 ($ 33,200; £ 25,000) for a prepaid trip from Vietnam to London – through Russia, Poland, Germany and France. It was organized by a Vietnamese contact at home.
"I have friends in Vietnam in the UK who will help me find a job when I get to There, "he told me." These friends help me get on trucks or container ships to get across the border. "
Read more of Lucy's story from camp here.
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