Police are searching farmland for the remains of a man who was a suspect in the murder of Nottingham jeweller, Marian Bates, almost 10 years ago.
James Brodie, 20-years old in 2003, disappeared from his home in Nottingham, shortly after Mrs Bates was shot.
Detectives have thought for some time that Brodie may have been murdered.
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She was last seen in Warwick earlier today.
A man, reportedly armed with a knife and a baseball bat, was detained close to the event and police cleared the area as a precaution.
Tens of thousands of people are expected to line the streets this weekend.