Bodies of 39 people have been found inside a truck in Essex, England.
The police were called by the ambulance service, after the incident was discovered at Waterglade Industrial Park, Eastern Avenue.
A 25-year-old man from Northern Ireland, who drove the container has been arrested on suspicion of murder, according to authorities.
Essex Police said the vehicle travelled from Bulgaria into the country via Holyhead, Anglesey, on Saturday.
Reports say preliminary investigation revealed that there were 38 adults and one teenager in the truck.
However, it was not stated if any survivor was found.
Superintendent Andrew Mariner said officers were trying to identify victims, but noted that it will take a “lengthy process”.
“We have arrested the lorry driver in connection with the incident, who remains in police custody as our inquiries continue,” he said.
British Prime Minister, Boris Johnson, tweeted that he was “appalled by this tragic incident”
He said: “I am receiving regular updates and the Home Office will work closely with Essex Police as we establish exactly what has happened. My thoughts are with all those who lost their lives and their loved ones.”
Also, Priti Patel, the Home Secretary, said she was “shocked and saddened by this utterly tragic incident”, while Thurrock MP Jackie Doyle-Price said it was “sickening news”
“People trafficking is a vile and dangerous business,” Ms Doyle-Price tweeted, adding that she hoped Essex Police could “bring these murderers to justice”.