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.
US President Donald Trump called off plans for renewed military strikes on Iran at the last minute on Thursday, saying negotiations with Tehran had advanced to the highest levels of Iran's leadership and had been approved by a broad coalition of regional powers.
A US jet fired two missiles into the engine room of the tanker Jalveer off Oman on Thursday, US Central Command confirmed, as authorities said the 20 crew members were safe after the third strike on Indian-crewed tankers this week.
British defence minister John Healey quit on Thursday in a dispute over military spending, accusing Prime Minister Keir Starmer of failing to commit the government resources that are needed to defend the country at a time of heightened threat.
A false alarm at the Pentagon following an air quality warning briefly triggered a partial shelter-in-place order on Wednesday at the US military's headquarters, as first responders worked to rule out exposure to hazardous materials, officials said.
The United States will hit Iran "very hard tonight" and will soon take control of the Middle Eastern country's oil and gas infrastructure and markets, US President Donald Trump said on Thursday.
The UAE has launched a humanitarian initiative called 'Step of Hope' to provide prosthetic limbs for Palestinians who have suffered amputations during the ongoing conflict in the Gaza Strip.
Her Highness Sheikha Latifa bint Mohammed bin Rashid Al Maktoum, Chairperson of Dubai Culture and Arts Authority, has held a series of meetings and visits in Sweden aimed at strengthening cooperation in innovation, technology and economic development.