At least 24 people have been killed in Israel as Iran launched retaliatory airstrikes targeting civilian areas. A U.S. Embassy branch in Tel Aviv suffered minor damage.

The U.S. president faces pushback over the risk of U.S. involvement in the escalating conflict between Israel and Iran.

Three people were killed in a missile strike at Israel's largest oil refinery, a day after the facility came under [a barrage that partially knocked it offline](

Iranian media report new Israeli attacks on the west of the country on Monday, after Iranian strikes broke through Israel's iron Dome defences overnight.

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.

Investors have been weighing the odds of further escalation in the conflict and spillover into the broader oil-rich Middle East.

Abas Aslani, Iran-based journalist and senior research fellow at the Center for Middle East Strategic Studies describes to CNN’s Polo Sandoval on “Early Start” how people in Tehran are feeling, including the unity they’ve found amid Iran’s escalating tensions with Israel.

Longstanding tensions came to a head last week when Israel launched a missile attack on Iran, targeting the country's nuclear facilities and killing several high-level military personnel and nuclear scientists. In the days following the two countries have exchanged missile strikes, killing at least 78 in Iran and 13 in Israel.

The president had opposed Israeli action against Iran but came to believe that Israel had reason to act and that the U.S. would have to lend some support.

Israel’s military said it hit command centers of Iran’s Revolutionary Guard, while Iranian strikes overnight killed several people.