The death of 15 medics and humanitarian workers in Gaza after shots were fired at their ambulances raises further concerns of “war crimes by the Israeli army,” the UN High Commissioner for Human Rights said on Thursday.

Israel has vowed to escalate the nearly 18-month war with Hamas until the militant group returns dozens of remaining hostages, disarms, and leaves the territory.

Gaza's Health Ministry says an Israeli airstrike has killed at least 27 Palestinians sheltering at a school in northern Gaza and wounded 70 more.

Israel’s military “will seize large areas” of the Gaza Strip to expand its security zones, its defense minister said as he called for a large-scale evacuation of the Palestinian enclave's population.

Israeli Defense Minister Israel Katz announced Wednesday a major expansion of the military’s operation in Gaza involving the seizure of large areas of land that would be “incorporated into Israel’s security zones.

Israel has been accused of executing Palestinian paramedics after bodies were found in a mass grave with their hands tied and bullet wounds to the head.

Israeli Prime Minister Benjamin Netanyahu said that the pressure on Gaza would increase until the remaining hostages were returned to Israel. “The more they do not give (back the hostages), the more the pressure will increase until they do,” vowed the Israeli Prime Minster in a video statement released on Wednesday.

Anger is growing in the Gaza Strip with anti-Hamas protests and the killing of a member of the militant group.

Prime Minister Benjamin Netanyahu said Israel had seized a corridor of land that would split one of Gaza’s largest cities from the rest of the enclave.