 UN investigators have reported mass killings of Yazidi men and boys who refused to convert to Islam.In Baghdad, hundreds of Assyrian Christians fled their homes in 2007 when a local extremist group announced that they had to convert to Islam, pay the jizya or die.In March 2007 the BBC reported that people in the Mandaean ethnic and religious minority in Iraq alleged that they were being targeted by Islamist insurgents, who offered them the choice of conversion or death.