From southern Lebanon rockets fired into Israel on Sunday, Lebanese security sources said, a small town in northern Israel, residents reported hearing an explosion.
Israeli military spokesman said: "The sound of explosions, soldiers are looking for the area. Reasons still under investigation." The second Israeli military sources said the blast could be because mortars.
Events in the region tensions Syria civil war. Damascus has said it earlier this month against suspected Iranian missiles destined for the Lebanese militant group Hezbollah in the Syrian response to Israeli air strikes.
Rocket launcher, you can hear from the Lebanese town of Marjayoun, about 10 kilometers from the Israeli border (6 miles), in the towns of Lebanon resident said.
Earlier on Sunday, two rockets fired at southern Beirut, a Shiite area, Hezbollah leader Hassan Nasrallah promised that his Shiite Muslim guerrilla group will fight Syrian President Pakistan Funchal Assad until victory.
Assad fighting a two-year insurgency, the United Nations says at least 80,000 people were killed.