A murder investigation has been launched after the discovery of 39 dead bodies in a lorry container in Essex in the early hours of Wednesday morning.
Early indications suggest 38 of the deceased are adults and one is a teenager.
A 25-year-old man from Northern Ireland has been arrested on suspicion of murder.
A cordon has been put in place and access to and from the Waterglade Industrial Park, where the lorry container was found, remains closed.
Chief Superintendent Andrew Mariner said: “This is a tragic incident where a large number of people have lost their lives. Our enquiries are ongoing to establish what has happened.
“We are in the process of identifying the victims, however I anticipate that this could be a lengthy process.
“We believe the lorry is from Bulgaria and entered the country at Holyhead on Saturday 19 October and we are working closely with our partners to investigate.
“We have arrested the lorry driver in connection with the incident who remains in police custody as our enquiries continue. I appreciate this cordon is going to disrupt the activity of local businesses in the area and we will work to ensure that disruption is kept as short as possible. We are working with Thurrock Council to mitigate against any impact our investigation scene will have locally.”