Mohammed Abu Salmiya, the director of al-Shifa hospital in Gaza City, was among dozens of Palestinians freed and returned to Gaza yesterday, according to Israeli authorities.
The doctor, who had been held by Israel without charge since being arrested at his workplace in November, said he and other prisoners suffered "almost daily torture" while in detention in Israel.
Mistreatment included assaults with batons and dogs, deprivation of food and medicine, as well as physical and psychological humiliation, Abu Salmiya told reporters.
Other detainees released alongside Abu Salmiya also alleged abuse.
The claims could not be independently confirmed, but matched other accounts of Palestinians who have been held in Israeli custody.
Abu Salmiya also said medical staff at various facilities where he was held had taken part in the abuse "in violation of all laws" and that some detainees had limbs amputated because of poor medical care.
There was no immediate response from the Israeli prison service, which has previously denied multiple similar accusations.
The release of Abu Salmiya prompted a political row in Israel, with the country's most senior officials denying prior knowledge of the move.
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