The bombing of a Moscow concert hall left at least 137 dead and even more wounded.
The regrouped ISIS - now ISIS K- have claimed responsibility even though Putin is insisting on blaming Ukraine.
Why has ISIS come for Putin? What does it tell us about the strategic alignments now dominating the Middle East, and does this act of terror bring the threat of more closer to home?
Also - another by-election looms in the marginal seat of Blackpool South as Tory MP Scott Benton resigns. And Donald Trump wins a golf course. Organised by Donald Trump.
Editor: Tom Hughes
Senior Producer: Gabriel Radus
Producer: Laura FitzPatrick
Social Media Editor: Georgia Foxwell
Video Production: Shane Fennelly and Arvind Badewal
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