Israel launched strikes on Iran’s capital early Friday, with explosions booming across Tehran as Israel said it targeted nuclear and military sites.

Iran quickly retaliated by sending a swarm of drones at Israel, and Supreme Leader Ayatollah Ali Khamenei warned of “severe punishment.”

Israel's ongoing airstrikes and intelligence operation and Iran's retaliation raised fears of all-out war between the countries and propelled the region, already on edge, into even greater upheaval.