A Hezbollah-run television channel reported that an Israeli air strike aiming to destroy a downed drone caused a blast in a remote area in the Bekaa region in the western of Lebanon on Sunday.
Al Jazeera reported that an Israeli air raid was carried out in the town of Saghbeen in the southern region of the Bekaa Valley. An Israeli warplane reportedly fired a missile on a hill south of the town.
Before the attack, an Israeli drone was said to have been seen flying over the regions of the al Shikh Mountain heights and other areas of the West Bekaa, Al Jazeera reported.
A Lebanese security source also told Reuters that the reason for the blast "is still not 100 percent clear but most probably it was an Israeli air strike to destroy their drone."
LNB, the Lebanese state news agency, said that the sound of huge blast was heard in the region Shaghbeen and Barouk mountain, but its cause is still unknown.
“One of the sources said the explosion could have been caused by an Israeli air strike on Lebanon, while another said an Israeli drone may have been downed,” Reuters reported.
Reuters added that one of the sources refused to give further details while another one said that a "proper investigation" was still to be undertaken into the blast to know the real facts about what happened.
It was not clear if there were casualties. Al Jazeera reported that the targeted region was not prohibited, but it is just a few kilometres away from Hezbollah bastions as well as a Lebanese military base in the region.
No comments were made by the Israeli military.
Several air strikes have been carried out by Israel in neighbouring Syria since the start of the four-year civil war there.
Israeli air strikes on Syria have targeted weaponry which Israeli officials claimed were destined for Lebanon's Iran-backed Shiite militia group Hezbollah.
In 2006, Hezbollah and Israel fought a 34-day war in which hundreds of people were killed.
In January this year, an Israeli helicopter attacked the Golan Heights in Syria, killing several prominent Hezbollah members and an Iranıan general. Days later, Hezbollah hit back with a rocket attack and killed two Israeli soldiers on the border with Lebanon.