PA MediaThe BBC has said it should have cut away from a live broadcast of Bob Vylan's performance at Glastonbury, during which the band's singer led the crowd in chants of "death, death to the IDF [Israel Defense Forces]".In a statement issued on Monday, the BBC said: "The team were dealing with a live situation but with hindsight we should have pulled the stream during the performance. We regret this did not happen."It comes after the broadcast regulator Ofcom said the BBC "clearly has questions to answer" over its coverage, and the government questioned why the comments were aired live.The organisers of Glastonbury have previously said they were "appalled" by the comments, which "crossed a line".On Monday, a BBC spokesperson said: "The BBC respects freedom of expression but stands firmly against incitement to violence. "The antisemitic sentiments expressed by Bob Vylan were utterly unacceptable and have no place on our airwaves."On Monday, Ofcom said it was in contact with the BBC and had asked for clarification over why the comments were broadcast.A spokesperson for the regulator said: "We are very concerned about the live stream of this performance, and the BBC clearly has questions to answer."We have been speaking to the BBC over the weekend and we are obtaining further information as a matter of urgency, including what procedures were in place to ensure compliance with its own editorial guidelines."Bob Vylan are a London-based English punk-rap duo, who formed in Ipswich in 2017. They were performing on the festival's West Holts stage.