dertyA series of car bomb attacks in Iraq’s capital killed 38 people in Shiite areas Saturday, authorities said, after Islamic militants killed a journalist working for a local television network in a Sunni province. The attacks come as Iraq faces its greatest challenge since the 2011 withdraw of U.S. troops, as militants from the Islamic State group now hold vast swaths of the country and neighboring Syria. Police officials said the first bombing happened Saturday night when a suicide bomber rammed his explosive-laden car into a security checkpoint in Baghdad’s northern district of Khazimiyah, killing 13 people, including three police officers, and wounding 28. The second car bombing, targeting a commercial street in Shula district in northwestern Baghdad, killed seven people and wounded 18, police said. The blast damaged several shops and cars. More