Iran fired a new wave of missile attacks on Israel early Monday, triggering air raid sirens across the country as emergency services reported at least five killed and dozens more wounded in the fourth day of open warfare between the regional foes that showed no sign of slowing.

The latest salvo comes after a weekend of escalating tit-for-tat attacks between Israel and Iran that raised fears of a wider, more dangerous regional war.

Dozens of others were injured overnight across Israel, the authorities said. Israel was striking military sites in Iran and the four-day-old conflict showed no sign of slowing.

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."

Israel and Iran kept up their attacks, killing and wounding civilians and raising concern among world leaders meeting in Canada this week that the biggest battle between the two old enemies could lead to a broader regional conflict.

Videos of the damage suffered by the US Embassy branch in Tel Aviv are going viral on social media, showing glass window panes shattered inside the building.

Iran has retaliated against Israeli strikes with ballistic missiles in Jerusalem and Tel Aviv. Rep. Eugene Vindman, member of the House Armed Services Committee, joins The Weeknight to break down the escalating violence in the Middle East,