A farm in Norfolk has launched its own investigation into an undercover film showing cruelty to ducks by workers.
The footage was filmed at Hall Farm, Hingham, by staff from Norfolk-based Hillside Animal Sanctuary.
The RSPCA and the police were investigating the film showing ducks being swung by their necks and being thrown at other birds.
In a statement Hall Farm said it had launched its own inquiry and it had suspended the contract duck catchers.
Waitrose said it was "appalled" and had ended its contract with the supplier.
The farm said: "We have launched an inquiry to try and get to the bottom of these allegations.
"As part of this process the contract catchers who came onto the farm, none of whom are controlled by or contracted to us, have all been suspended".
The RSPCA said it was investigating after being shown the footage, filmed in December, by Sky News.
Police said they had visited the farm on Tuesday.
A spokeswoman added: "Following a site visit officers are satisfied there are no ongoing issues of cruelty and police continue to assist RSPCA colleagues in their investigations."
A spokesman for Waitrose, which had been supplied with ducks from the farm, said: "We are appalled by the footage taken at Hall Farm.
"Following an immediate and detailed investigation, we have now ended our relationship with the farm."