Baghdad, July 20 (IANS) Iraq's Prime Minister Nuri al-Maliki Sunday slammed as criminal acts the displacement of Christian citizens by the Islamic State (IS) extremist group from **rthern Iraqi city of Mosul, calling for a worldwide unified stand against the militants. A statement issued by Maliki's ****** said the IS militant threat against the Christian mi**rity in its seized areas "reveals without any doubt the extremist criminal and terrorist nature of this group, and the danger it represents to the humanity and its centuries-old heritage", Xinhua reported. The Iraqi prime minister's comments came in the wake of hundreds of Christian families fleeing their homes in militant-held Mosul Saturday fearing an ultimatum to accept extremist militants' options.