For the second time in less than a week, rockets have been found in a school in Gaza operated by the United Nations Relief and Works Agency, the body said.

“Today, in the course of the regular inspection of its premises, UNRWA discovered rockets hidden in a vacant school in the Gaza Strip,” the organization said in a statement issued Tuesday. “As soon as the rockets were discovered, UNRWA staff were withdrawn from the premises, and so we are unable to confirm the precise number of rockets. The school is situated between two other UNRWA schools that currently each accommodate 1,500 internally displaced persons.”

As it did the last time around when missiles were found in a school it operates, UNRWA said it “strongly and unequivocally condemns the group or groups responsible for this flagrant violation of the inviolability of its premises under international law.”

UNRWA, the UN agency charged with overseeing humanitarian efforts in Gaza, said it immediately “informed the relevant parties and is pursuing all possible measures for the removal of the objects in order to preserve the safety and security of the school.” The organization again pledged to launch a “comprehensive investigation into the circumstances surrounding this incident.”

Israeli officials reacted furiously to the discovery. “How many more schools will have to be abused by Hamas missile squads before the international community will intervene,” Foreign Ministry spokesperson Yigal Palmor told The Times of Israel. “How many times can it turn its head the other way and pretend that it just doesn’t see?”

Last Wednesday, UNRWA found some 20 rockets in a school under its auspices, also during a standard inspection. A spokesperson for UNRWA said the organization gave the rockets to “local authorities,” which answer to the Hamas-backed unity government led by Palestinian Authority President Mahmoud Abbas. “According to longstanding UN practice in UN humanitarian operations worldwide, incidents involving unexploded ordnance that could endanger beneficiaries and staff are referred to the local authorities,” UNRWA’s director of advocacy and strategic communications, Christopher Gunness, told The Times of Israel Sunday.

In Jerusalem, such assertions are rejected, even ridiculed, with officials charging that the weaponry was returned to Hamas. “The rockets were passed on to the government authorities in Gaza, which is Hamas. In other words, UNRWA handed to Hamas rockets that could well be shot at Israel,” a senior Israeli official told The Times of Israel.

Another senior official pointed out that UNRWA has a history of letting Hamas use its facilities for its terrorist activities. “Time and again, over the years, UNRWA has been abused by gunmen from different terrorist factions who are using UN facilities to stockpile weapons, to fire rockets from, to steal UNRWA humanitarian equipment and to cause damage and fire in UNRWA’s hangars,” a senior Foreign Ministry official told The Times of Israel.

“Against all evidence, UNRWA refuses to acknowledge reality and pathetically attempts to ingratiate itself with Hamas, pretending that nothing serious has happened,” the senior official said. “This is a classic case of beaten-wife syndrome, which we have been witnessing for years from UNRWA. The people of Gaza, and indeed taxpayers from countries who contribute to UNRWA’s budget — including Israel — deserve better.”