A rocket attack on northern Israel from southern Lebanon has highlighted the security challenges facing the incoming Israeli government. Three people were slightly injured when the missile exploded near a house.One witness said: “I was sleeping and I heard something like a bomb. I got up and saw police around the place. I went outside and saw something unbelievable — a Katyusha rocket.” Israel fired at least six artillery shells in response but it is not thought these caused any injuries. Lebanese security sources said two rockets had been fired from near the city of Tyre and that one landed inside the Lebanese border. No group has claimed responsibility but a spokesman for Hezbollah, the dominant force in southern Lebanon, said it was not behind the rocket attacks. The incident comes a day after Likud leader Benjamin Netanyahu began the task of forming a new coalition government in Israel. The right wing leader is expected to take a tougher line than his predecessor on security and peacemaking with Israel’s enemies.