Glastonbury bosses have said they are "appalled" by comments made by rap duo Bob Vylan during their performance at the festival Saturday.

The Glastonbury Festival’s official response to chants of “Death to the IDF” and “From the river to the sea” from the stage this weekend was slammed Sunday by the Simon Wiesenthal Center, with the Jewish advocacy group’s CEO calling the statement “bland,” “cowardice” and “complicity.”

"I said what I said," English punk singer Bobby Vylan wrote in a statement after drawing backlash for his comments onstage.