The driver at the time of discovery was a 25-year-old man from Northern Ireland; he was arrested at the scene, on suspicion of murder. The lorry has been reported as a chiller lorry; the container is kept frozen to preserve perishables, and may have been as cold as −25 °C (−13 °F).[4] Such trailer containers are normally airtight, which creates a suffocation risk for any occupants.[2]