A pattern of abuse at a residential hospital uncovered by BBC Panorama has been condemned as "shocking" by the government.
It comes after Bristol police arrested and later bailed four people over the treatment of patients with learning difficulties at Winterbourne View.
Care Services Minister Paul Burstow said he was determined to strengthen safeguards for vulnerable adults.
NHS South West said it had been "appalled" by the issues raised.
The hospital's owners, Castlebeck, have apologised and suspended 13 employees.
