The Newscast Security Briefing

<p>Three people have been arrested and are suspected of spying for Russia in the UK. It’s BBC correspondent Daniel De Simone’s exclusive, and he’s in the studio to give the background.

And, information from 10,000 employees at the Police Service of Northern Ireland has been mistakenly released.

An ex PSNI officer is on to discuss why many are feeling unsafe as a result, as well as Jordan Dunbar, presenter of BBC podcast series Blood On The Dance Floor, which is about the killing of a Northern Irish police officer.

BBC security correspondent Frank Gardner describes what the intelligence services are focussing on, and is on throughout.

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Today's Newscast was presented by James Cook. It was made by Chris Flynn with Clare Williamson and Joe Wilkinson. The technical producer was Emma Crowe. The editor is Damon Rose.</p><p>This podcast has been edited since it was first published to delete a section in which a contributor said police suspect the Real Ira of the shooting of an officer and the killing of journalist Lyra McKee. In fact police believe the New Ira are responsible.</p><p>01:04 - PSNI data leaks

14:32 - Three are suspected of spying for Russia

20:38 - The focus of British intelligence services</p>