British counter terrorism officers are investigating the stabbing last Friday of an Iranian TV host outside his home in London. Iran International presenter Pouria Zeraati was hospitalised, before being discharged and moving to a safe place under the supervision of the Metropolitan Police. We talk to British Iranian journalist Sima Sabet, who has also been targeted. Have US diplomats been targeted by Russian sonic weaponry? A joint report between The Insider, Der Spiegel and CBS's 60 Minutes alleges it’s the result of their brains being targeted by "directed energy" weapons operated by a secretive Russian military unit. We meet one of the journalists involved in the story. In Londonderry journalists covering a dissident republican parade on Easter Monday were attacked with petrol bombs thrown by masked youths. Politicians have condemned the violence. We hear the testimony of one of the reporters targeted. We talk to the producers behind the successful BBC reboot of Gladiators.And as Gmail celebrates its 20th anniversary, how useful is email today as a form of communication? Or has it been overtaken by messaging apps like WhatsApp?Presenters: Ros Atkins and Katie RazzallProducer: Simon RichardsonGuests: Sima Sabet, former presenter, Iran International; Dan Baldwin, Managing Director, Hungry Bear Media; Julia Hobsbawm, journalist and author; Niall Deeney, Derry Correspondent, Belfast Live; Mike Isaac, Tech Reporter, The New York Times; Shashank Joshi, Defence Editor, The Economist; Michael Weiss, Editor, The Insider