Israeli forces fighting in Gaza have killed more than 170 gunmen during their days-long raid at the Palestinian enclave’s main hospital, the military has said, Reuters reports.

Israeli troops entered Al Shifa Hospital in Gaza City in the early hours of Monday morning and have been combing through the sprawling complex, which the military says is connected to a tunnel network used as a base for Hamas and other Palestinian fighters.

“Thus far, the forces eliminated more than 170 terrorists in the area of the hospital, questioned over 800 suspects, and located numerous weapons and terror infrastructure,” the military said.

In recent days, Hamas spokespeople have said that the dead announced in previous Israeli statements were not fighters but patients and displaced people and have accused Israel of war crimes.

The Israeli military, which has lost two soldiers in combat at the hospital, says it is preventing harm to civilians, patients and medical staff there.

Reuters has been unable to access the hospital and verify either account.