[Source: Reuters]

Iran fired a salvo of ballistic missiles at Israel on Tuesday in retaliation for Israel’s campaign against Tehran’s Hezbollah allies in Lebanon.

Alarms sounded across Israel and explosions could be heard in Jerusalem and the Jordan River valley after Israelis piled into bomb shelters. Reporters on state television lay flat on the ground during live broadcasts.

Iran’s Revolutionary Guards said Iran had launched tens of missiles at Israel, and that if Israel retaliated Tehran’s response would be “more crushing and ruinous”.

A senior Iranian official later told Reuters that the order to launch missiles at Israel was made by the country’s Supreme Leader Ayatollah Ali Khamenei. Khamenei remains in a secure location, the senior official added.

The Israeli army said Israel’s airspace was closed following the Iranian attack.

Reuters journalists saw missiles intercepted in the airspace of neighboring Jordan. Israeli army radio said nearly 200 missiles had been launched into Israel from Iran.

Earlier, the military had announced that any ballistic missile strike from Iran was expected to be widespread and told the public to shelter in safe rooms in the event of an attack.

Iran has vowed to retaliate following attacks that killed the top leadership of its Hezbollah allies in Lebanon.

The firing of missiles came after Israel said its troops had launched ground raids into Lebanon, though it described the forays as limited. The Israeli campaign in Lebanon is the biggest escalation of regional warfare since fighting erupted in Gaza a year ago.

In Washington, U.S. President Joe Biden said the United States was prepared to help Israel defend itself from Iranian missile attacks.

“We discussed how the United States is prepared to help Israel defend against these attacks, and protect American personnel in the region,” Biden said on X about a meeting held with Vice President Kamala Harris and the White House national security team earlier in the day.

The Iranian missile launches came after Israeli ground troops launched raids into Lebanon and its warplanes bombed from the skies.

Though so far characterized by Israel as limited, the first ground campaign into Lebanon for 18 years would pit Israeli soldiers against Hezbollah, Iran’s best-armed proxy force in the Middle East.

It marks the biggest escalation of regional warfare since fighting erupted in Gaza a year ago, and follows weeks of intense airstrikes that have decapitated Hezbollah by killing most of its top leaders. More than a thousand Lebanese have been killed and a million have fled their homes.

Iran had vowed to retaliate against Israel, raising fears that war could spill across borders throughout the region, despite efforts by the United States, Israel’s closest and most powerful ally, to contain it.

In the latest announced killing of a senior Hezbollah figure, Israel earlier said it had assassinated Muhammad Jaafar Qasir, describing him as a commander in charge of weapons transfers from Iran and its affiliates.

The rapid escalation that has engulfed Lebanon into war has killed hundreds. Near the city of Sidon along the Mediterranean south of Beirut, mourners wept over coffins containing black-shrouded bodies of people killed in Israeli strikes.