It’s been an unsettling few days with two major knife crimes in Sydney.  The Bondi Junction attack left six dead and just days later there was an alleged act of terrorism at a church in the city’s west.  The circumstances are very different, but leaders are calling for calm and for the community to come together.  Today, extremism expert Josh Roose on what we know about the latest attack and the threat of terrorism.  Correction: This episode included a misleading quote of NSW Police Commissioner Karen Webb discussing the Bondi attacker, when we were discussing the alleged church offender. We have removed this audio.  Featured:  Josh Roose, associate professor of politics at Deakin University