United Kingdom police on Wednesday arrested a 25-year-old driver from Northern Ireland on suspicion of murder after 39 bodies were found in the back of an Essex semi-trailer east of London.
Essex Police say 38 of the bodies found at Waterglade Industrial Park in Gray, Essex, are adults and one is a teenager. The area is surrounded by police.
"This is a tragic incident in which a large number of people have lost their lives. Our investigations continue to determine what happened," said Superintendent Andrew Mariner. "We are currently in the process of identifying the victims, but I suppose it can be a lengthy process.
" We have arrested the truck driver in connection with the incident, which remains in police custody while our investigations continue. "he added.
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The truck came from Bulgaria through the Welsh city of Holyhead, police said according to the BBC.
British Prime Minister Boris Johnson tweeted that he was "horrified" by the incident. "My thoughts are with all those who have lost their lives and their loved ones," he said in a statement.
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In 2000, 58 Chinese immigrants were found dead in the back of a truck in Dover, the BBC reported.
The Associated Press contributed to this report.