Following the knife attack in a shopping mall in Sydney, speculations and false allegations were spread online at an alarming rate. It even led to an innocent man being labelled as the attacker.

Mark Lowen speaks to the BBC’s Sydney correspondent Katy Watson on the shock and sorrow in the country. And BBC Disinformation & Social Media Correspondent Marianna Spring tells him about her experience confronting one of the people at the heart of the social media frenzy.

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This episode was made by Alice Aylett Roberts and Emilia Jansson. The technical producers were Mike Regaard and Dafydd Evans. The assistant editor is Sergi Forcada Freixas and the senior news editor is Sam Bonham.