حزب التحرير
It has been reported that Man Haron Monis the gunman who took hostages in a siege at the Lindt Chocolate Café in Sydney, was radicalised by members of Hizb ut-Tahrir. In June 2014 Monis attended a presentation by Hizb ut-Tahrir which was held in response to an earlier Hizb ut-Tahrir lecture titled 'Honour Killings are Morally Justified', which was cancelled.