But the Dec. 9 riot has raised important questions about security at the upcoming royal wedding.
The attack – in which protestors surrounded the Rolls Royce, reportedly shouting "off with their heads!" – has heightened speculation that the nuptials of Prince William and Kate Middleton will be the focus of more disruption. Reports have surfaced about anarchist groups who plan to target the wedding (and have even set up Web sites to recruit supporters).
Should police increase the number of officers on duty in London on April 29, this would add to a security budget that's already in the multi-million dollar range. According to the respected Daily Telegraph, the estimated security detail for the big day should come in around $8 million.
A Scotland Yard spokesman would only say, "It's too early to talk about the royal wedding." Prince Charles's office had no comment.
As for Charles and Camilla post-attack, "Both their Royal Highnesses were unharmed and neither of them needed medical treatment," a palace source tells PEOPLE. The following day, the prince carried out a planned engagement and the duchess took one of her grandchildren to a theater in London.