The Israeli army said on Saturday it had called up reservists to bolster its forces along the borders with Lebanon and Syria, amid fears of a regional escalation as tensions with Iran reach unprecedented levels.

The sweeping attacks by Israel, which began early Friday, have killed more than 70 people, including four of Iran’s top security chiefs, and damaged Iran’s main nuclear site at Natanz. Iran retaliated by launching scores of missiles at Israel. At least three people have been killed and dozens more wounded during these attacks.

Follow the latest news after Israel launched strikes at Iran, a dramatic escalation in long-running tensions between the two countries.

Sirens sounded in Israel as Iran launched dozens of ballistic missiles in retaliation for Israel's strikes on its nuclear facilities.

Fears are growing that a wider conflict could erupt in the Middle East following strikes on Tehran’s nuclear facilities

Iran responded with an aerial attack involving about 100 drones, Israel said, but all of them were shot down before hitting their target. The U.S. did not provide any assistance or have any involvement in the Israeli strike, a U.S. official told ABC News.

Israel’s army has raided a village in southern Syria to arrest several alleged agents of the Palestinian militant group Hamas

Gen. Hossein Salami was the chief of one of the country’s most powerful centers, and his death was a tough blow to Iran’s embattled leadership, which has had a series of setbacks in the past 20 months of Middle Eastern war and unrest. Salami rose to power six years ago and had a history of threatening the U.S. and Israel.

"This confrontation will not end with last night's limited actions and Iran's strikes will continue, and this action will be very painful and regrettable for the aggressors," Fars reported, citing senior military officials.