A suicide bomber detonated an ambulance Friday at a Shiite wedding party in a village south of Baghdad, killing at least seven people and injuring 16, hospital officials said. The bride and groom were among the injured, officials said. The attack took place in a village near Youssifiyah, 12 miles south of Baghdad. Members of the Shiite Buamer tribe were celebrating a wedding when the ambulance drove up and exploded, according to Saadoun Abdullah of the general hospital in Mahmoudiya, where some of the victims were taken.Salah al-Ameri, a cousin of the groom, said the suicide attacker stormed the garden where the wedding celebration was taking place and detonated the vehicle. "The ambulance tried to approach the garden earlier but cars of the guests were blocking the way," al-Ameri said. "After the dinner, many of the guests left and the ambulance returned and the suicide attacker drove into the garden." He said dozens of people were at the place when the incident occurred. The Buamer tribe has had tense relations with Sunni Muslim clans in the area, local residents say, and several of their members have been killed or kidnapped by Sunni insurgents.