Now, the BBC has seen evidence that doctors, nurses, and other hospital staff were detained, beaten, and prevented from carrying out vital medical duties when Israeli forces overran a hospital in Gaza last month.

Israel said it occupied Nasser Hospital, believing it was used by Hamas, and said several released Israeli hostages were also held there, as our correspondent, Wura Davis, reports.

Not for the first time in this war, Israeli soldiers have been filmed standing over, stripped and kneeling detaunees in Gaza. But these are medical staff detained after the Israeli army overran the NASA Hospital in Hanunis. Most of them are still held captive. For weeks, the medics had witnessed Israel's military advance closing in around their hospital. The fighting in Khanunis was fierce. Thousands of people who'd sought refuge in the grounds, fled under gunfire. What should have been a place of safety was completely the opposite. One nurse was shot inside a hospital operating theater through a window. Another person shot at the main entrance. The hospital was under siege. On February the 15th, after giving warnings, Israeli tanks medics overrun the hospital. There were chaotic scenes as troops took control. Patients who'd been unable to evacuate were moved by medics from collapsing wards. Israel says it found Hamas weapons, also medication, which they say supports accounts from Israeli hostages that they were held there. In the IDF's own footage, you can see that hospital patients had their hands zip-tied, detained outside buried in their beds and wheelchairs. This was when troops also detained the medical personnel, more than 50 of them, forced to leave their posts and remove their surgical clothing.

Israel says it did so in case there were concealed weapons, and that among the 200 arrested at Nasser were terrorists posing as medics. Dr. Amira Assouli had remained at NASA throughout the siege, before the Israeli incursion, risking her own neck to save lives as people were shot inside the grounds. She later witnessed what happened to her fellow doctors.

It was tough for us to see how the doctors who'd bravely stayed at the hospital, despite the dangers, were stripped and beaten. Their hands were tied behind them, and they were left in the sun for hours.

His hand, broken in captivity, Dr. Ahmed Saba is one of the very few medics to have since been released. He shows the positions they were forced to adopt for hours and says they were also tortured..

They forced They forced us to kneel down with our eyes, blind folded. There was a pit in the ground, and we thought they would execute us and bury us there. We said our prayers, but they were just intimidating us.

Israel says any abuse of detainees is against IDF orders and is strictly prohibited. But crucially, according to the hospital manager who dealt with the Israelis during the raid, the detention of so many of his staff left its hospital woefully short of doctors.

Eight doctors and 15 nurses were left treating 250 patients. You can imagine the level of care we could give with no water or electricity in the hospital at that point. During this time, 13 patients and injured people died.

The Israeli Army says it operated within NASA in a precise and focused manner, and says it provided equipment enabling it to function and treat patients. But with the war continuing and at least 46 medics still detained or missing, the hospital has been closed for for weeks. Rida Davis, BBC News.