Israeli forces have arrested dozens of staff, including a hospital director after raiding the last major functioning health facility in northern Gaza, Gaza’s ministry of health says.

Kamal Adwan hospital in Beit Lahia has been under a tightening Israeli blockade imposed on parts of northern Gaza since October, when the military said it had launched an offensive to stop Hamas from regrouping there.

Israeli troops stormed one of the last hospitals operating in northern Gaza on Friday, forcing many staff and patients outside to strip in winter weather, the territory’s health ministry said. The army denied claims it had entered or set fire to the complex and accused Hamas of using the facility for cover.