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.
Israel and Iran have exchanged airstrikes on Wednesday, as Iran again rejected President Donald Trump's claim that the US was in negotiations to end the war, which has roiled energy and financial markets, saying the US is negotiating with itself.
Kuwait's Directorate General of Civil Aviation (DGCA) has announced on Wednesday that a drone targeted a fuel tank at Kuwait International Airport, which led to a fire breaking out on the site.
The Pentagon is expected to send thousands of soldiers from the army's elite 82nd Airborne Division to the Middle East, according to reports on Tuesday, adding to the massive military buildup even as the Trump administration seeks talks with Iran.
The Philippines is working with Washington to secure waivers and exemptions so it can obtain oil from US-sanctioned countries to ensure supply, its ambassador to the United States has announced.
The National Transportation Safety Board said on Tuesday that a system which would have allowed a New York airport controller to track movement of aircraft and vehicles did not alert during a Sunday night fatal collision between an Air Canada commercial jet and a truck that killed two pilots.
A rare Russian daytime drone attack on Ukraine killed three people, wounded several dozen and set a building in the historic centre of the western city of Lviv aflame on Tuesday, officials said, following an overnight bombardment that killed five.
A total of 69 people died when a Colombian military plane crashed soon after takeoff earlier this week, the country's armed forces said in a statement on Tuesday, in an incident that injured 57 others.
The Ministry of Defense (MoD) have offered their condolences to the family of a Moroccan civilian contractor in the UAE Armed Forces who was killed during a routine mission in Bahrain following an Iranian missile attack.
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