BAGHDAD – Islamic State extremists unleashed a wave of suicide attacks targeting the Iraqi army in western Anbar province, killing at least 17 troops in a major blow to government efforts to dislodge the militants from the sprawling Sunni heartland, an Iraqi military spokesman said Wednesday. The attacks came just hours after the Iraqi government on Tuesday announced the start of a wide-scale operation to recapture areas under the control of the IS group in Anbar. Brig.