A man has been arrested after 1,600 pigs were found dead at a farm in Harewood, West Yorkshire.
The 52-year-old man was questioned on suspicion of causing unnecessary suffering to the animals, which were found in varying states of decomposition at the farm last month.
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It is believed live pigs were found among the carcasses.
Environmental health offices from Leeds City Council are investigating suggestions that the animals starved to death.
It follows a call to police shortly before 9pm on 12 November after concerns were raised for the welfare of a man at the farm.
The investigation is being led by environmental health officers from Leeds City Council, who are working with police and the Animal and Plant Health Agency.