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.