The warning came on the fourth day of the conflict, when the Israeli military claimed it had achieved air superiority over the Iranian capital and could fly over the city without facing major threats.

Trump said Sunday he remained optimistic about Israel and Iran reaching a deal, but added "sometimes they have to fight it out."

CNN's Scott Jennings remains, however, as IDF issues evacuation warnings to Tehran and both sides claim casualties and injuries in the hundreds.

At least seven people were killed and more than 100 injured when an Iranian ballistic missile hit Bat Yam, just south of Tel Aviv, overnight on Sunday, domestic media reported. Other reports put the death toll at six people. Israel's police said residential buildings took a "direct hit that caused extensive damage."

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.

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