67. Aiding and abetting riot, etc.
If a person aids and abets a riot or unlawful assembly, with the knowledge that unlawful violence is intended or is likely to be used, he or she commits the offence of aiding and abetting violence of any kind or degree which is committed by any other person in executing the purposes of the riot or assembly, although he or she did not expressly intend to aid and abet violence of that kind or degree.