From the Associated Press in London:

Jockey Paul O'Neill will be investigated by the sport's governing body after television replays showed him head-butting his horse, City Affair.

The Horseracing Regulatory Authority (in Britain) made the decision Monday to hold an inquiry after reviewing TV footage from the incident at the Stratford races on Sunday.

"We haven't got a date set, but we are going to go for some time next week -- our inquiry day is usually on the Thursday," HRA spokesman Owen Byrne said.

City Affair was being unruly in the parade ring, ultimately throwing O'Neill.

The jockey got to his feet and grabbed the reins, pulling the horse to him, before lowering the butt of his helmet into it.

"Angry jockey does a 'Zidane' to his horse," read the headline of London's Evening Standard, referring to French soccer star Zinedine Zidane's infamous head-butt in the World Cup final.

City Affair went on to finish fourth in the two-mile event.

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