In this Sunday, Feb. 24, 2013 photo, women walk past a poster of Shiite religious leaders and a Shiite fighter killed during a fight between US troops and al-Mahdi Army militia in the Jihad neighborhood of west Baghdad, Iraq. Fliers claiming to be from a new Iranian-linked Shiite militant group began turning up last week in front of Iraqi Sunni households bearing a chilling message: Get out now or face "great agony" soon. Their reemergence now, nearly a decade after the U.S.-led invasion, is a worrying sign that rising sectarian tensions are again gnawing away at Iraqi society and could undo fragile gains made in recent years. (AP Photo/ Karim Kadim)

Associated Press
In this Sunday, Feb. 24, 2013 photo, women walk past a poster of Shiite religious leaders and a Shiite fighter killed during a fight between US troops and al-Mahdi Army militia in the Jihad neighborhood of west Baghdad, Iraq. Fliers claiming to be from a new Iranian-linked Shiite militant group began turning up last week in front of Iraqi Sunni households bearing a chilling message: Get out now or face "great agony" soon. Their reemergence now, nearly a decade after the U.S.-led invasion, is a worrying sign that rising sectarian tensions are again gnawing away at Iraqi society and could undo fragile gains made in recent years. (AP Photo/ Karim Kadim)
In this Sunday, Feb. 24, 2013 photo, women walk past a poster of Shiite religious leaders and a Shiite fighter killed during a fight between US troops and al-Mahdi Army militia in the Jihad neighborhood of west Baghdad, Iraq. Fliers claiming to be from a new Iranian-linked Shiite militant group began turning up last week in front of Iraqi Sunni households bearing a chilling message: Get out now or face "great agony" soon. Their reemergence now, nearly a decade after the U.S.-led invasion, is a worrying sign that rising sectarian tensions are again gnawing away at Iraqi society and could undo fragile gains made in recent years. (AP Photo/ Karim Kadim)
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