Israel's military said the air force had concluded a wave of overnight strikes targeting air defenses in the area of Tehran. "We damaged—and will continue to damage—strategic sites and enemy sources of knowledge,

The retaliatory strikes came on Saturday, a day after Israel killed top Iranian military leaders and scientists and destroyed an aboveground nuclear enrichment plant near Natanz.

As the attacks escalate, with fatalities and injuries reported on both sides, Israel issued the stark warning to Iran.

Israel's attack on Iran raises questions like whether the US will get involved, how Iran will respond, and if a wider conflict may be triggered.

Stocks are down on Friday, with oil prices surging in the wake of the Israel's military strike on Iran. The S&P 500 slid 48 points, or 0.5%, to 5,998 points in early trading, while the Dow Jones Industrial Average dropped 559 points,