The Israeli military was on Monday investigating a possible overnight attack launched from Lebanon on a northern border village, after residents reported hearing explosions. "Residents in Metulla reported hearing booms. We are still checking the area and haven't found anything yet," a military spokeswoman told said. There was no official confirmation from Beirut, but military and security sources in southern Lebanon reported hearing the "sound of a blast", without being able to provide details on its source. The report comes less than a day after two rockets exploded in the Hezbollah heartland of Beirut's Shiite southern suburbs, wounding four Syrian workers.