Online videos of the rap trio Kneecap calling for the death of British MPs and shouting "Up Hamas, up Hezbollah" are now being investigated by the police.     It comes after MPs condemned the group and called for arts funding to be removed and their invitation to play at Glastonbury withdrawn.     Band members have apologised but have been cancelled by a number of festivals.     So, who are Kneecap and why are they creating such a stir?     Niall Paterson talks to Aoife Moore, journalist and author of The Long Game: Inside Sinn Fein. He also talks to Steve Cummins, former Ireland Editor for the NME.  Producer: Natalie Ktena  Editor: Philly Beaumont