A rocket has been fired from southern Lebanon towards Israel, Lebanese media and security sources say.
The rocket launch could be heard from the Lebanese town of Marjayoun, about 10km (6 miles) from the Israeli border, the National News Agency reported.
The Israeli military said it was investigating reports from residents of the northern Israeli town of Metula that they had heard an explosion.
However, no launch was detected and there were no reports of any damage.
"An explosion was heard. Soldiers are searching the area. The cause is still being investigated," an Israeli military spokeswoman told Reuters news agency.
A second Israeli military source said it was probably a mortar.
It is not clear who was responsible, but the military wing of the Shia Islamist movement, Hezbollah, and several Palestinian militant groups are known to operate in southern Lebanon.
Earlier, two rockets were fired into an area of the capital, Beirut, controlled by Hezbollah, wounding at least four people. It came a day after the group's leader, Hassan Nasrallah, promised it would stay in the Syrian conflict to the very end as Lebanese interests were at stake.
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