Chief Superintendent Steve Neill says officers would like to hear from people who may have seen anything unusual in Stanley Street at any time in the last few days.
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The vintage Palitoy Jawa, with vinyl cape, sold for almost £22,000. It is one of only a handful known to exist.
John Marshall has been charged with eight counts of indecent assault relating to alleged offences committed between 1980 and 1982.
A student who describes herself as "one of the lucky ones" was one of hundreds of people gathered at Grey's Monument at 11 o'clock.