The United Nations has accused Israel of “severe violations” of a 50-year-old agreement with Syria, saying it has engaged in “engineering groundwork activities” that encroach on a key buffer zone in the Golan Heights.

The United Nations says Israeli construction along a demilitarised buffer zone with Syria has led to “severe violations” of a 50-year-old ceasefire agreement, which risk increasing tensions along their shared frontier in the occupied Golan Heights.

The U.N. says Israel violated a ceasefire agreement with Syria as it continues a major construction project in the Golan Heights.

The United States on Tuesday said Israel is not currently impeding humanitarian aid for the Gaza Strip and therefore is not violating U.S. law, avoiding restrictions on U.S. military aid. Israel has said it met most of the 16 specific demands put forward by Washington but was still discussing some items.

Israel rejected on Wednesday accusations made by eight international aid groups, including Oxfam and Save the Children, that Israel had failed to meet U.S. demands to improve the humanitarian situation in Gaza.

The United States will not withhold military aid from Israel, the State Department said Tuesday, despite the situation in Gaza not improving, according to aid groups and U.N. officials.