The 2013 Hawija clashes relate to a series of violent attacks within Iraq, as part of the 2012–2013 Iraqi protests and Iraqi insurgency post-U.S. withdrawal. On 23 April, an army raid against a protest encampment in the city of Hawija, west of Kirkuk, led to dozens of civilian deaths and the involvement of several insurgent groups in organized action against the government, leading to fears of a return to a wide-scale Sunni–Shia conflict within the country. By 27 April, more than 300 people were reported killed and scores more injured in one of the worst outbreaks of violence since the U.S. withdrawal in December 2011.