Israeli warplanes struck a target in eastern Lebanon near the border with Syria on Monday, security sources told Reuters.
It was not immediately known what the target was or the exact location of the air strike, which occurred in a mountainous area near the border.
The Israeli army declined to comment but an Israeli security source confirmed that there has been "unusually intense air force activity in the north", referring to Lebanon.
Israeli airstrikes, believed to target Hezbollah posts or shipments, have been reported at the Lebanese-Syria border.
According to local reports, the two strikes seem to be in Syria's territory.
Two Lebanese soldiers died after a suicide car bomb exploded at an army checkpoint in northeastern Lebanon near the Syrian border, security sources told Reuters.
The attack at the entrance to the city of Hermel, an area where the Shi'ite political and militant movement Hezbollah has a strong presence, also injured several people.
A car bomb has exploded at a Lebanese army checkpoint in the Hermal area of northeastern Lebanon, according to Reuters.
The number of casualties is currently unknown, however the attack was a suicide bombing, the report adds.
A explosion in the southern suburbs of Lebanon's capital Beirut has killed two people and wounded six, security sources told Reuters.
The area is a stronghold of support for the Shi'ite political and militant movement Hezbollah.
Iran's embassy in the same area was targeted by a bomb attack in November.
ITV News has heard the accounts of two Syrian families who could be among the vulnerable refugees admitted to Britain.Read the full story ›
ITV News Middle East correspondent Geraint Vincent has tweeted:
Lebanon Foreign Minister tells me 'it's crazy that the Iranians are not here - how can there be agreement without them?' #Geneva2
Lebanon FM Adnan Mansour says starting talks with demand that Assad goes is totally counter-productive #Geneva2
A Twitter account purportedly run by the Lebanese branch of the Nusra Front, a Syrian rebel group with links to al Qaeda, has claimed responsibility for a suspected suicide bomb attack in Beirut.
At least four people have been killed in a blast in Beirut's southern suburbs, a security source has told Reuters, attributing the blast to a suicide bomber wearing an explosive belt.
The source said another 20 people were wounded in the explosion, which occurred in a stronghold of the military and political movement Hezbollah.