TEHRAN - Air raid sirens were sounding across Israel as Iran launched dozens of drones and missiles toward Israel for its April 1 attack on the consular section of the Iranian embassy in Syria.

The drones and missiles were targeted at installations inside occupied territories inside Israel.

According to Al Jazeera, US National Security Council spokesperson Adrienne Watson says President Biden is being “regularly updated” and that Iran’s “attack is likely to unfold over a number of hours”.

Reportedly, Iran's retaliatory drone and missile attacks on Israel early Sunday dealt "heavy blows" to an air base in the Negev desert.

"The most important Israeli air base in the Negev was the successful target of the Kheibar missile," the official IRNA news agency said, adding that "images and data indicate that the base sustained heavy blows."