A suspicious device which led to part of Selby town centre being cordoned off as bomb disposal experts were called in turned out to be an old car part. Builders found the heavy cast iron device and, worried that it may be an unexploded bomb or grenade, called in police.
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They are renowned as being the finest and most complete medieval city walls in England.
Humberside Police are to begin a trial where officers use spit guards. A quarter of injuries to officers are caused by spitting or biting.
Ian Moore, aged 40, went missing from Grantham on April 6.