BAGHDAD — A series of bomb attacks struck marketplaces near Baghdad on Friday, killing at least 15 people, Iraqi officials said as security forces recaptured parts of a strategic Sunni oil town north of the capital from self-proclaimed Islamic State militants. Iraq is embroiled in its worst crisis since the 2011 withdrawal of US troops in the wake of a blitz this year by the group, which has seized a third of the country’s territory. After heavy fighting overnight, Iraqi security forces backed by Shiite volunteers managed to push into the strategic oil town of Beiji on Friday, taking control of some of the town’s southern districts, according to officials. Meanwhile, a bomb went off around noon at a sheep market in Baghdad’s western suburb of Suweib, killing five people and wounding 13, police officials said. Another bomb struck a commercial street in the nearby Radhawniyah, another western Baghdad suburb, killing two people and wounding nine. Earlier in the day, a bomb blast near an outdoor market in the town of Madain, just south of Baghdad, killed four people and wounded 11. And in Youssifiyah police said an explosion at an outdoor market killed four people and wounded 10. — AP