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.
After weeks of protests, fraud accusations and review of contested ballots in a razor-thin race, conservative Keiko Fujimori was officially declared the winner of Peru's presidential race by the country's electoral office on Friday.
Rescuers cleared the rubble in the Ukrainian capital Kyiv on Friday in a search for survivors, as flags were lowered to half mast to mark a day of mourning, a day after a Russian missile and drone attack killed at least 30 people.
A Ukrainian woman is the main suspect in a bomb attack that targeted a wealthy businessman in Monaco, officials said on Friday, adding that the suspect had fled to Germany and had likely not acted alone.
The World Health Organisation (WHO) announced on Thursday the launch of clinical trials for two potential treatments for the Ebola virus in the Democratic Republic of the Congo, with the first patient enrolled in the study.
India has issued notices to messaging platforms Telegram and Signal asking them to explain safeguards around features that allow users to post messages without revealing their phone numbers, a government source said.
Rebels in Indonesia's restive easternmost region of Papua on Thursday shot dead an American pilot and set a civilian plane on fire in what a spokesperson for a local separatist group described as a message to the US and Indonesian governments.
Russian forces attacked the Ukrainian capital Kyiv on Thursday, killing at least 10 people and wounding more than 50, as drones and missiles struck residential buildings in what Russia said was a retaliation for recent attacks on its civil infrastructure.
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