The investigation stems from alleged videos from a Kneecap gig where the rap trio apparently shouted, “Up Hamas, up Hezbollah.” Per the BBC, both militant groups are banned in the U.K. and expressing support for them is a crime.

Artists including CMAT, Massive Attack, The Pogues, Brian Eno, Pulp, Paul Weller, former BBC Radio 1 DJ Annie Mac and Primal Scream have defended the band

The Metropolitan Police say there are 'grounds for further investigation' into the videos.