Hezbollah chief Hassan Nasrallah on Wednesday warned Israel against waging war on Lebanon.

"If the enemy thinks of waging a war on Lebanon, we will fight without restraint, without rules, without limits, and without restrictions," Nasrallah said in a televised speech.

"We are not afraid of war," he added.

His warning comes a day after Saleh Arouri, a senior Hamas official, was killed in a drone attack in Beirut.

Arouri was a key contact for Hamas and Hezbollah, two Iran-allied groups that Israel, the United States, Germany and others have classified as terrorist organizations.

Nasrallah said Arouri's death represented "a major, dangerous crime about which we cannot be silent."

He blamed the attack on Israel, although the country has not confirmed whether it was behind Tuesday's strike.

Hezbollah and Israeli forces have exchanged rocket fire numerous times since the October 7 terror attacks by Hamas on Israel, sparking fears that Israeli military operations in Gaza could spread across the region. 

However, clashes have so far been largely limited to exchanges of fire over their shared border.