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A 20-year-old whose online identity was 'Australi Witness' - an ISIS agent apparently living in Perth - has been arrested at his parents' place in Florida over plotting a bomb attack at a 9/11 memorial event.

A young Jewish American man has been charged with pretending to be an Australian-based Islamic State jihadist after a FBI joint investigation with the Australian Federal Police based on information provided by Fairfax Media.
 
Joshua Ryne Goldberg, a 20-year old living at his parents' house in US state of Florida, is accused of posing online as "Australi Witness," an IS supporter who publicly called for a series of attacks against individuals and events in western countries.