Iran on Saturday called for the United Nations Security Council to meet over Israel's actions in Lebanon and across the region, Iran's U.N. ambassador Amir Saeid Iravani wrote in a letter to the 15-member body after Israel killed Hezbollah leader Sayyed Hassan Nasrallah.

"The Islamic Republic of Iran strongly warns against any attack on its diplomatic premises and representatives in violation of the foundational principle of the inviolability of diplomatic and consular premises and reiterates that it will not tolerate any repeat of such aggression," he wrote.

"Iran will not hesitate to exercise its inherent rights under international law to take every measure in defense of its vital national and security interests," Iravani said.

Amid escalating tensions between Israel and Hezbollah, especially after the killing of Hezbollah leader Hassan Nasrallah, Iran has called an emergency meeting of the UN Security Council as it seeks to take revenge on the Jewish nation.

A projectile was fired by Lebanon following Nasrallah's killing, which crashed into the Israel-occupied West Bank area on Saturday, causing a fire. However, no injuries were reported in the incident.

Air raid sirens were also sounded on the outskirts of Jerusalem and the West Bank, according to Israeli alert apps, which the Israeli military said were triggered by "a launch from Lebanon toward Israeli territory".

In his first public statement, Israeli Prime Minister Benjamin Netenyahu described the killing of Hassan Nasrallah as "a historic turning point".

Israeli strikes in Lebanon killed 33 people and wounded 195 others on Saturday, the Lebanese health ministry said. More than 1,000 people have been killed and more than 6,000 wounded as a result of Israeli attacks in the past two weeks, and about one million Lebanese have been displaced by the strikes.

Thousands of Iranians took to the streets on Saturday in Tehran and across the country, condemning the killing of Hezbollah chief Hassan Nasrallah and seeking 'revenge' against Israel’s offensive against Lebanon. Images showed protesters carrying portraits of Nasrallah and chanting slogans like "Revenge," "Down with Israel," and "Down with the US".

Iranian Supreme Leader Ayatollah Ali Khamenei has reportedly been moved to a secure location in Iran following Nasrallah's killing.