"The United Nations Relief and Works Agency discovered a hand grenade and a military vest in a vacant school in the Gaza Strip, the organization announced on Wednesday night.
'As soon as the items were discovered, they were removed and UNRWA informed the de facto authorities in Gaza and in Israel.
'UNRWA strongly and unequivocally condemns the individual or group responsible for this flagrant violation of the inviolability of its premises under international law and calls on the de facto authorities in the Gaza Strip to ensure that this inviolability is respected and upheld,' UNRWA said..."