Israeli commandos are searching through every building and every floor of Gaza’s Al-Shifa hospital while hundreds of patients and medical staff remain in the complex, an Israeli military official was quoted by Reuters as saying.

“The operation is shaped by our understanding that there is well-hidden terrorist infrastructure in the complex,” the official said, declining to be named.

“Hamas weapons and equipment” had been found in Al-Shifa, the official said, adding that “Hamas has persistently worked to conceal infrastructure and cover up evidence” in Gaza’s hospitals.

Hamas has denied operating out of medical facilities.