An Israeli military observation tower overlooking the Mediterranean Sea and part of the maritime border with Lebanon, is seen near Rosh Hanikra, in northern Israel October 13, 2020. REUTERS/Ammar Awad The Iran-backed terrorist group Hezbollah broadcast a clip threatening a Mediterranean gas field off the Israeli coast on Sunday, as an American envoy traveled to Beirut to discuss maritime boundary negotiations with Jerusalem. The Hezbollah clip features apparent footage of vessels at Karish — an offshore gas field that Israel has said is firmly within its exclusive economic zone, and which Lebanon maintains is in disputed waters. The vessels in...