Chickens slowly freezing to death, being boiled alive, drowned or suffocating under piles of other birds are among hundreds of shocking welfare incidents recorded at US slaughterhouses, according to previously unpublished reports. An investigation by the Guardian and the Bureau of Investigative Journalism looked at hundreds of inspection logs from the USDA detailing incidents in poultry plants across the country. Inspectors recorded numerous incidents where: chickens suffocated to death beneath other chickens when they piled up on a conveyor belt that had stopped due to a mechanical failure; chickens drowned after entering the scalding tank while conscious; thousands of birds died of heat stress ... or alternatively, freezing to death. In one incident in January, more than 34,000 chickens froze to death while being kept overnight outside a slaughterhouse in a truck. The ... findings have fuelled concerns that a post-Brexit trade deal with the US could see the UK flooded with chicken produced to lower welfare standards. This follows last years transatlantic row over chlorinated chicken, which prompted political interventions in both countries. The violations were witnessed between 2014 and this year at some of the largest poultry processors in the country as part of the national inspection system.