LONDON, UK. (THECOUNT) — A horror scene is playing out in London Wednesday after 39 people were found dead inside a big rig container, according to reports.

Police in southeastern England said the 39 people were all found deceased Wednesday inside a truck container believed to have come from Bulgaria. All of the victims were said to be adult, except for one victim that appeared to be a teen.

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The truck, which is said to have entered Britain via the Welsh port of Holyhead on Saturday, was found by ambulance workers at Waterglade Industrial Park in Grays, a town just by the River Thames around 25 miles (40 kms) east of central London.

“This is a tragic incident where a large number of people have lost their lives. Our enquiries are ongoing to establish what has happened,” Essex Police Chief Superintendent Andrew Mariner said. “We are in the process of identifying the victims, however I anticipate that this could be a lengthy process.”

A 25-year-old-man from Northern Ireland has been arrested on suspicion of murder. He remains in custody. He has not been charged or identified.

A cordon has been put in place and access to and from the industrial park remains closed, reports CableOne.

“We are working with Thurrock Council (the local authority) to mitigate against any impact our investigation scene will have locally.” Mariner said.

Prime Minister Boris Johnson pledged in a tweet to work closely with Essex Police to establish exactly what happened.

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Geo quick facts: London, the capital of England and the United Kingdom, is a 21st-century city with history stretching back to Roman times. At its centre stand the imposing Houses of Parliament, the iconic ‘Big Ben’ clock tower and Westminster Abbey, site of British monarch coronations. Across the Thames River, the London Eye observation wheel provides panoramic views of the South Bank cultural complex, and the entire city – wikipedia.