LONDON (AP) — U.K. police announced Monday that the weekend performances by rap punk duo Bob Vylan and Irish-language band Kneecap at the Glastonbury Festival are subject to a criminal investigation after they led crowds in chants calling for “death” to the Israeli military and chants of “Free Palestine.”

A criminal investigation has been launched over performances by Bob Vylan and Kneecap at Glastonbury on Saturday, Avon and Somerset Police has said. The force said it had appointed a senior detective to investigate whether comments made by either act amounted to a criminal offence after reviewing footage.

UK police on Monday launched a criminal investigation into remarks made by rap groups Kneecap and Bob Vylan during the Glastonbury festival, as the US revoked visas for the latter after its frontman led an anti-Israel chant.