Iraqi Kurdish youth have reportedly been fighting alongside jihadists in Syria.
Iraqiya List leader Ayad Allawi said demonstrations in the country wouldn't stop unless Prime Minister Nouri al-Maliki resigns.
Failures in post-invasion state-building are fueling ongoing sectarian strife in Iraq.
Iraq needs a political solution that recognizes the grievances of Iraq's Sunni populations and regions.
The oil-rich province of Kirkuk remains one of Iraq's most disputed and politically flammable regions ten years after Saddam Hussein was toppled.
The month of April has been one of the deadliest in Iraq since 2008 with more than 712 killed.
The Iraqi government has banned 10 TV channels for covering the violence in Hawija, further raising political tensions in the country.
Relations between Iraq and Iran have grown rapidly recently, leading some to question whether a powerful alliance could emerge that threatens Western interests.
The Syrian conflict is increasing the danger of a sectarian war in Iraq.
A Saudi Wahhabi sheikh has issued a fatwa in which he calls on jihadists in Iraq to kill Shiites, including women and children.