Organizers of the Glastonbury Festival said Sunday they are "appalled" by the onstage statements of the punk duo Bob Vylan, whose singer led the crowd in a series of chants including "Death, death to the IDF" and "Free Palestine" the day before.

The rap duo have come under fire for encouraging audiences at the U.K. music festival to join in on shouting "death to the IDF" during their set.

British police said they were examining videos of a band that led chants of “death to the IDF” — Israel Defense Forces — at the Glastonbury Festival. Rapper Bobby Vylan, of rap punk duo Bob Vylan, led crowds attending the festival on Saturday in chants of “free,