I deeply regret that such offensive and deplorable behavior appeared on the BBC,' director-general Tim Davie wrote.

The prime minister is involved; so is the U.S. deputy secretary of State. The BBC is changing policies. But Bob Vylan remains steadfast.

“The BBC Board met on Tuesday to hear what actions will now be taken. The Executive have agreed to put in place a set of strengthened editorial practices and policies for live music programming. These will be important measures to safeguard future live broadcasts from a failure such as this.