Several slaughtered animals were found when police and commercial standards officers uncovered what was believed to be an illegal pig farm in the village of Leicestershire.
Four men were arrested on suspicion of causing unnecessary suffering to animals at the building in Lear, near Lottorworth, over the weekend.
A number of pigs, believed to have been killed illegally, were discovered at the site in Downton Road on Saturday morning (December 11).
Read more: Get the latest crime and police news from LeicestershireLive
In a statement, Leicestershire Police said another pig must be culled by a vet because of its condition, while officials from Leicestershire Trade Standards have taken out several other pigs.
“We were called at approximately 8 a.m. on Saturday to a farm in Downton Road, Lear, following concerns about a large number of vehicles parked at the site,” a force spokesman said.
“Force Wildlife Officers in the Harborough District Police District attended the scene, where a number of pigs believed to have been illegally slaughtered were found.”
They added: “A vet was called to the scene and a number of pigs were euthanized. Other pigs on the farm have been taken to Leicestershire County Council.
Leicestershire Trade Standards officers have also been contacted with the RSPCA.
Among those arrested was a 72-year-old man from Leicester. Two 31-year-old men from Birmingham and a 34-year-old man from Coventry were also arrested at the scene.
The spokesman added that they have since been released but are still “under investigation” while investigators and officials are conducting further investigations.
Police said the investigation was led by Leicestershire Trading Standards.
A spokesman for Leicestershire County Council, which runs the Trade Standards team, said: “Our investigation is ongoing and we will continue to work closely with the police.”
Keep up with the latest news with our email alerts straight to your inbox. Subscribe by clicking here.