BAGHDAD, Iraq (AP) - A suicide bombing ripped through a popular Baghdad kebab restaurant at lunchtime, killing at least 16 people and wounding 25 Sunday as insurgents stepped up attacks nationwide, defying two major U.S.-led offensives aimed at routing foreign fighters. The bomber detonated a vest laden with explosives at about 2:45 p.m. in the Ibn Zanbour restaurant, which is just 400 yards from the main gate of the heavily fortified Green Zone and is especially popular with Iraqi police and soldiers. Six police officers were among those killed, while the injured included 12 police officers, Iraqi army Maj. Falah...