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.

Bob Vylan, a London-based duo which often tackles racism in its tracks, was slammed by international and British politicians after the group led the crowds in chants of "Death to the IDF" -- the Israeli military.

Prime Minister Keir Starmer said after the show there was "no excuse for this kind of appalling hate speech".

Avon and Somerset Police in southwest England said a "criminal investigation is now being undertaken" after reviewing "video footage and audio" of both Kneecap and Bob Vylan.

"The investigation will be evidence-led and will closely consider all appropriate legislation, including relating to hate crimes," police said in a statement.

The BBC apologised for not pulling the live stream of Bob Vylan's performance at the festival over the weekend.

"With hindsight........

© Al Monitor