The bodies of 39 people were found in a truck container in Essex.  The vehicle, registered in Bulgaria, was found shortly before 1:40 a.m. BST at Waterglade Industrial Park in Gray, police said.
All in the container were killed, 38 adults and one teenager, Essex police said.
The truck driver, a 25-year-old man from Northern Ireland, was arrested on suspicion of manslaughter.
Police believe that the vehicle was traveling from Zeebrugge, Belgium, to the Thames River Purfleet.
It landed in the Throrock area shortly after 00:30, Reuters reported.
Deputy Chief of Police Pipa Mills said that identifying the victims remains a "number one priority" but is expected to be a "lengthy process".
The National Crime Agency has stated that it has sent staff to assist and identify any organized crime groups that may have played a role. "
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Richard Burnett, CEO of the Road Transport Association, stated that the container appears to be a refrigerated unit where temperatures
He defined the conditions for anyone inside as "absolutely appalling" ".
Govo A Bulgarian Ministry of Foreign Affairs official confirmed that the truck was registered in the country.
"The Scania truck was registered in Varna (on the east coast) under the name of an Irish-owned company. "
" Police said they were very unlikely to be Bulgarians, "he added.
Police called witnesses and anyone with information about the truck's route to contact them.
Prime Minister Boris Johnson said it was an "unimaginable tragedy and truly heartbreaking."
Speaking to the PM, he said: "I know that the thoughts and prayers of all members will be with those who have lost their lives and their loved ones.
" I receive regular updates. The internal office will work closely co-operation with the Essex police until we find out exactly what happened. "
" Pursuit of life "
During PMQs, Ms. Doyle-Price says, "Putting 39 people in a locked metal container shows disdain for a human life that is evil, The best thing we can do in memory of these victims, is to find the perpetrators and bring them to justice. "
Mr. Johnson replied, saying," all such traffickers must be sought and prosecuted. "
Labor leader Jeremy Corbin said it was "an incredible human tragedy", adding: "Can we just think for a moment what it must be like for these 39 people, obviously in a desperate and dangerous situation to end their lives , suffocated to death in a container? "
Irish Prime Minister Leo Varadcar told Dale that investigations would be undertaken to determine if the truck had passed through Ireland.
How Many Migrants Have Killed in Transit?
The number of migrants dying in transit has been registered by the UN since 2014.
Since then, five bodies of suspected migrants have been found in trucks or containers in the UK:
- 2014 : Afghan migrant found dead in the Tilbury, Essex. It was in a shipping container, with 34 Afghans surviving
- 2015 : Two migrants were found dead in a wooden crate in a warehouse in Branston, Staffordshire. Checkout sent from Italy
- 2016 : An 18-year-old migrant is crushed while clinging to the underside of a truck in Banbury, Oxfordshire
- 2016 : Found in the back of a truck in Kent body traveling from France
Data were not collected in the same way before the onset of the migrant crisis in 2014, but such deaths are not new.
In 2000, 58 Chinese migrants were found strangled in a truck in Dover.
In 2015, the bodies of 71 people were found in an abandoned truck on an Austrian highway. Police suspect the vehicle was part of a Bulgarian-Hungarian human trafficking operation.
Essex Police set up a Victims Bureau to call everyone who is concerned about loved ones.
The British Red Cross confirmed that staff and volunteers are helping "those who deal with this terrible tragedy".
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