An Israeli air strike targeted a senior Hezbollah commander in Beirut's southern suburbs late on Tuesday.
The Israeli military said it was in retaliation for a cross-border rocket attack three days before that killed 12 children and teenagers.
A loud blast was heard and a plume of smoke could be seen rising above the southern suburbs - a stronghold of the armed group Hezbollah - at around 7:40 pm (1640 GMT), a Reuters witness said.
A senior Lebanese security source said a senior Hezbollah commander had been the target of the air strike and his fate remained unclear.
Lebanon's state-run national news agency said an Israeli air strike had targeted the area around Hezbollah's Shura Council in the Haret Hreik neighbourhood of the capital.
Beirut has been on edge for days ahead of an anticipated Israeli attack in reprisal for the rocket strike on the Israeli-occupied Golan Heights on Saturday that killed the 12 youngsters in a football field in a Druze village.
Hezbollah has denied involvement in that attack.
As diplomats sought to contain the fallout, US Defence Secretary Lloyd Austin said he did not believe a fight was inevitable between Hezbollah and Israel, though he remained concerned about the potential for escalation.
Russia and Ukraine each exchanged 307 of their service personnel on Saturday on the second day of a prisoner exchange that, when completed, is set to be the largest such swap in the three-year war between the two countries.
U.S. President Donald Trump has suggested the prisoner swap - which should see 1,000 prisoners released on each side over three days - could herald a new phase in stop-start efforts to negotiate a peace deal between Moscow and Kyiv.
Saturday's swap was announced by Russia's defence ministry, and separately by Ukrainian President Volodymyr Zelenskiy in a post on social
French police were investigating a possible arson attack as being the main cause for a power outage which hit the Alpes-Maritimes region in southern France on Saturday, including Cannes which is hosting its world-famous annual film festival.
Russia launched dozens of attack drones and ballistic missiles at Kyiv overnight in one of the biggest combined aerial attacks on the Ukrainian capital of the three-year war, damaging several apartment buildings and injuring at least 15 people.
Rescuers on Friday pulled out all 260 mine workers who had been stuck for more than 24 hours in an underground shaft in South Africa, the mine's operator said.
The Trump administration issued orders on Friday that it said would effectively lift sanctions on Syria, after President Donald Trump this month pledged to unwind the measures to help the country rebuild after a devastating civil war.
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