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.

The IDF says Iran has launched about 100 drones towards its territory and says it killed Revolutionary Guards commander Hossein Salami in overnight strikes.

As tensions escalate, Iran has developed a range of calculated options to retaliate if attacked, raising the stakes for the entire region.

The strikes are a sign of Israel’s shift away from restraint, containment and short wars, and toward using force to project power across the Middle East.

At least 41 people in Israel were injured in retaliatory strikes by Iran. Iran launched dozens of ballistic missiles toward Israel on Friday night in retaliation for Israel's surprise attack early Friday.