BAGHDAD — Violence in Iraq killed seven people on Friday, the latest in worsening unrest that has hit the country despite weeks of wide-ranging operations targeting militants. Friday’s violence struck across the country — in Baghdad and to its north and south — with gun and bomb attacks hitting both Shiite and Sunni areas. In the deadliest incident, gunmen burst into a house in a mostly Shiite town north of Baghdad and killed three people. Violence in Hilla, south of the capital but also predominantly Shiite, left two dead. — AFP