Hamas attack on youth music festival in Israel-the worst massacre in county's history

Saturday's attack on the open-air Tribe of Nova music festival is believed to be the worst civilian massacre in Israeli history, with at least 260 dead and a still undetermined number taken hostage.
The party was held in a dusty field outside of Kibbutz Re’im, about 3.3 miles (5.3 kilometers) from the wall that separates Gaza from southern Israel.
Hamas is a designated terrorist group backed by Iran and that has governed the Gaza Strip since 2007.
Hamas began firing thousands of rockets on Saturday morning, striking targets as far away as Tel Aviv and the outskirts of Jerusalem, which rarely see any direct hits because of Israel's sophisticated Iron Dome missile defense system.
Backed by a barrage of rockets, Hamas militants stormed from the blockaded Gaza Strip into nearby Israeli towns
The unprecedented attack, which has killed at least 1300 people in Israel, Israel's Army Radio reported Monday. At least 3000 people have been injured, the Israeli Health Ministry said earlier.
More than 100 Israeli civilians, soldiers, and foreign nationals have also been taken hostage by Hamas, prompting Israeli Prime Minister Benjamin Netanyahu.
Israel on Sunday formally declared war on Hamas.