Liam O’Hanna, a member of the Northern Irish hip-hop group Kneecap, has been charged with a terrorism offense for allegedly displaying a flag in support of Hezbollah. The charge stems from an incident at a London concert last November.

Police were alerted to a video in April allegedly showing O’Hanna displaying the Hezbollah flag during the performance.

O’Hanna is scheduled to appear in court in London on June 18.

Kneecap is scheduled to perform at the Northside festival in Aarhus, Denmark, this summer, with O’Hanna slated to participate. His court appearance is scheduled 11 days after the planned concert in Denmark.