Israeli warplanes destroyed an empty building containing the offices of Hezbollah's south Lebanon commander in this southern port city Wednesday, and 12 people in a nearby structure were wounded, security officials and witnesses said. The explosions in the center of the city raised a giant column of smoke over Tyre, and electricity was knocked out in some areas. The target was seven-story building housing the office of Sheik Nabil Kaouk, the Hezbollah commander in south Lebanon. The building was heavily damaged, with the top floors were pancaked on top of each other, but witnesses and doctors said it was believed to be empty. The airstrike damaged a neighboring building, wounding 12 people, including six children. The wounded included a woman and child who were seriously hurt, said Dr. Ahmad Mroue at Tyre's hospital.