Israel and Iran have traded more missile attacks despite international calls for a halt to the fighting, with neither country showing signs of backing down as the conflict between the regional foes raged for a third day.

Israeli citizens were ordered to head to bomb shelters on Friday night amid retaliatory missile strikes from Iran.

Iran has hurled missiles into Israel, striking targets in cities like Tel Aviv. According to Iran, Israel’s attacks have killed hundreds of civilians, while Israel said Iranian strikes have killed more than a dozen. Iranian strikes have decimated blocks of Tel Aviv. The conflict is one of the most heated between the two countries in recent memory.

Airstrikes have rained down on Tel Aviv, Israel for the last three nights. The conflict between Iran and Israel has intensified after nuclear talks were called

Onlookers gathered on Saturday at a central Tel Aviv residential building next door to Israel’s defense headquarters that was damaged after it took a hit from what appeared to be shrapnel from an overnight missile barrage from Iran.

Delta Air Lines Inc. and United Airlines Holdings Inc. suspended flights to Tel Aviv following Israel’s bombing of Iran and the closure of Israel’s airspace.