The Indian Embassy in Israel has directed all its nationals currently present in Israel to stay vigilant and adhere to safety protocols as directed by local authorities amid the escalation in the Middle East crisis.

Iran launched a massive missile attack firing as many as 100 projectiles on Israel Tuesday to retaliate against the killing of Hezbollah chief in Beirut, media reports said.

The Indian Embassy said in a statement: "In view of the prevailing situation in the region, all Indian nationals in Israel are advised to stay vigilant and adhere to safety protocols as advised by the local authorities."

"Please exercise caution, avoid unnecessary travel within the country and stay close to safety shelters," the statement said.

The attack came amid Israeli strikes on Lebanon to target Hezbollah, which saw the execution of the militant outfit's commander Hassan Nasrallah, and a top official from Iran's Islamic Revolutionary Guard Corps.

According to the Israeli foreign ministry, the missiles were fired around 10 PM IST.

An hour later, around 11.10 pm, the Israel Defence Forces (IDF) said there was no more threat from Iran "for now".

The civilians were allowed to leave bomb shelters, adding that there were a few "hits" during the barrage.

Confirming the attack, Iran's Revolutionary Guards said it was in response to the killing of Nasrallah, Hamas political chief Ismail Haniyeh, and its senior commander Abbas Nilforoushan, said reports.

The Revolutionary Guards also threatened to carry out "crushing attacks" against Israel if it retaliated.