Prisoners held at an Israeli detention camp in the Negev desert are being subjected to widespread physical and mental abuses, with at least one reported case of a man having his limb amputated as a result of injuries sustained from constant handcuffing, according to two whistleblowers who worked at the site.

The sources described harrowing treatment of detainees at the Israeli Sde Teiman camp, which holds Palestinians from Gaza and suspected Hamas militants, including inmates regularly being kept shackled to hospital beds, blindfolded and forced to wear nappies.

One whistleblower, who has worked in the facility as a prison guard, said detainees were forced to stand up for hours, or to sit on their knees. The source, who spoke out at risk of reprisals, said several detainees were beaten with truncheons and not able to move their heads or to speak at the facility.

“The prisoners are detained in a sort of cages, all blindfolded and handcuffed,” the source said. “If someone speaks or moves, they are immediately silenced or they are forced to stand with their hands raised above their head and handcuffed for up to one hour.

“If they are unable to keep their hands raised, the soldiers attach the handcuffs to the bars of the cage. Many of the detainees had infected wounds that were not being properly treated.”

The source claimed the military had no proof that detainees were all members of Hamas, with some inmates repeatedly asking why they were there. According to the whistleblower, most were considered suspects and some were released. “But they had not been formally charged. It was a kind of filtering camp, a provisional detention,” he said.