Thirteen people suspected of entering the UK illegally have been found inside a lorry at a site on the Ransomes Industrial Estate in Ipswich.
The individuals were found inside an HGV at about 10:40 BST on Thursday 25 May, Suffolk Police have revealed.
Police were seen investigating the lorry, branded Romano, which was parked outside a facility on the industrial estate.
Three people have been arrested, including the male driver on suspicion of immigration act offences and taken to Martlesham Police Investigation Centre.
Emergency services remain at the site and officers are currently liaising with Home Office Immigration Enforcement.
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A spokesman for Suffolk police said: "Emergency services were called to the scene after a number of people were found in the back of a lorry, suspected to have entered the UK illegally.
"The 13 people were found by police within an HGV lorry on the Ransomes Industrial Estate, Ipswich at around 10.40am today Thursday 25 May.
"Officers remain at the scene at this time and are liaising with Home Office Immigration Enforcement.
"So far three arrests have been made, including the male driver of the vehicle. All have been arrested on suspicion of Immigration Act offences and have been taken to Martlesham Police Investigation Centre for questioning."
Tom Hunt, MP for Ipswich, said he was concerned at the news of the incident.
"There are still a number of facts that need to be established but clearly this is an unacceptable and illegal state of affairs," adding that the incident was "extremely dangerous" for those concerned.