The BBC "clearly has questions to answer" over its coverage of a performance by Bob Vylan at Glastonbury, the broadcasting watchdog Ofcom has said.
During Saturday's live broadcast, the band's singer led the crowd in chants of "death, death to the IDF [Israel Defense Forces]", comments the government and festival organisers have said they were "appalled" by.
The BBC has previously said the remarks were "deeply offensive" and the set will not be made available on iPlayer.
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."
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