Clowns from the Big Apple Circus conducted the training, called Clown U. Lessons for the aspiring clowns included parade etiquette (when faced with a crying child, walk away).

WSJ: On Thanksgiving, She Reigns in This Parade

The violence started on Sunday after a republican parade close to Carlisle Circus.

BBC: North Belfast riots: Robinson and McGuinness meet Baggott

The three nights of trouble started on Sunday after a republican parade close to Carlisle Circus.

BBC: North Belfast riots: Martin McGuinness blames bigotry