Israel has banned six aid groups from providing medical care to the people of Gaza. Doctors who have worked inside the Strip have issued warnings about the massive human toll Israel’s onslaught has wreaked.

On Thursday, the World Health Organization (WHO) said it was informed by Tel Aviv that healthcare workers from six groups, including the Palestinian American Medical Association (PAMA), can no longer provide aid in the besieged enclave.

The WHO is concerned Tel Aviv’s ban will add more stress to the Strip’s already strained healthcare system. The Gaza Health Ministry has reported nearly 100,000 injuries during the past year.

Israel made the decision to ban the organizations after 99 American healthcare workers signed an open letter accusing Israeli forces of intentionally murdering Palestinian children and estimating the number of dead in Gaza over the past year has surpassed 118,000.