Iraqi officials say a roadside bomb and a gun attack have killed four people and wounded seven others in Baghdad. The officials say the roadside bomb went off Friday morning near a market in Baghdad's teeming Shiite district of Sadr City. The explosion killed three people and wounded seven. The officials say the bomb was hidden under a heap of trash and detonated as shoppers started arriving. In the second attack, gunmen shot dead an Iraqi soldier in southern Baghdad after breaking into his house.