Iran's parliament speaker Mohammad Bagher Ghalibaf on Saturday denounced Israel's "crimes" as he visited the site of the deadliest Israeli strikes on central Beirut in recent weeks, an AFP photographer said.
A source close to Hezbollah had said Thursday night's strikes in the densely populated Basta neighbourhood and the nearby Nweiri district had targeted the Iran-backed Lebanese group's security chief Wafiq Safa.
While neither Israel's military nor Hezbollah confirmed Safa was the target or commented on his fate, Lebanon's health ministry said the strikes killed at least 22 people -- the deadliest inside the capital in weeks of escalation.
"International organizations and the UN Security Council have the capability (to stop Israel) but they are unfortunately keeping silent," he said.
Earlier Saturday, Ghalibaf met Lebanese Prime Minister Najib Mikati, who told him his government's priority was "to work towards a ceasefire", Lebanon's official National News Agency (NNA) said.
Mikati had on Friday urged the United Nations to pass a resolution calling for an "immediate" ceasefire between Israel and Hezbollah.
Ghalibaf told reporters after meeting his counterpart Nabih Berri, a key Hezbollah ally, that Iran "will certainly support the decisions of the Lebanese government, the Lebanese people, and the resistance (Hezbollah) in this period".
When Iran's Foreign Minister Abbas Araghchi visited Lebanon last week, he said Tehran backed efforts for a simultaneous ceasefire with Israel in both Gaza and Lebanon.
Ghalibaf was expected to head to Geneva later Saturday to participate in the Inter-Parliamentary Union, according Iran's state news agency IRNA.