Hip hop Irish trio Kneecap is being investigated by UK counter-terrorism police after videos emerged allegedly showing the band calling for politicians to be killed and shouting “up Hamas, up Hezbollah.

British counter terrorism police Thursday launched an investigation into online videos of Irish rap group Kneecap after the band denied supporting Hamas and Hezbollah or inciting violence against UK politicians.

In an open letter organised by Heavenly Recordings, Kneecap label, artists such as Massive Attack, Paul Weller and more say that “in a democracy, no political figures or political parties should have the right to dictate who does and does not play at music festivals or gigs that will be enjoyed by thousands of people.”