Bashing of principal remains mystery

Police have yet to catch the culprits behind the unprovoked bashing of a Christchurch school principal last month.

St Bede's College rector Justin Boyle was attacked by two youths while walking home from a social gathering around 12.30am on October 22.

But publicity about the attack has failed to prompt any witnesses to come forward.

Detectives have said the youths punched Mr Boyle to the ground and continued to assault him.