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.
The recovery of hundreds of bodies from the rubble of buildings destroyed by Israeli strikes in Gaza during the war that began nearly three years ago has raised fresh concerns about possible war crimes, the UN human rights chief said on Tuesday.
Indian police will question Google over a lack of safeguards after smashing a criminal network that set up and managed more than 500,000 fake Gmail accounts to send hoax bomb threats to government offices, a police official told Reuters on Tuesday.
The Saudi Arabian Civil Defence has issued an all-clear on Tuesday after issuing alerts about potential danger in six cities, including Yanbu, the kingdom's main Red Sea oil port, where millions of barrels a day are loaded.
Bahrain, Kuwait, and Jordan have extended their condolences to the UAE over the martyrdom of its two military servicemen, Major Abdullah Shams Al Menhaly and candidate Saeed Abdullah Al Shamsi, on Monday.
His Highness Sheikh Mohammed bin Rashid Al Maktoum, Vice President and Prime Minister of the UAE and Ruler of Dubai, met Syrian President Ahmad Al-Sharaa in Dubai and expressed optimism the "nation...will regain the global standing it deserves".
Abu Dhabi’s Department of Culture and Tourism has updated the emirate’s holiday home regulations, making the system faster, simpler and more user-friendly for owners and operators.
Syrian President Ahmad Al-Sharaa has highlighted how the country has transformed from being a "centre of conflicts into a centre of stability and a connecting point for investment and trade".