Unknown attackers, riding a speeding car, hurled three hand grenades at a coffee shop in Tripoli city, north Lebanon, on Saturday. Two of the grenades went off and wounded four people, local press said, noting that the attack took place on the New Street, downtown the restive city. Meanwhile, a Syrian gunship fired three missiles at the disputed border area of Wadi Ajram, near Arsal town. No casualties were reported from the attack which took place at 10:00 tonight