Sherena last seen during Friday morning's snow by the Willow School
Policeman Murder: Man Released
Detectives investigating the murder of a police officer in Northern Ireland have freed a 22 year old they arrested in Milton Keynes.
The man, from Omagh, Co Tyrone, was arrested in the new city on the evening of Monday 26 November 2012. He was released without charge on the evening of Wednesday 28 November.
Catholic constable Ronan Kerr, 25, was killed in a booby trap bomb attack in Omagh, Co Tyrone, in April 2011.
A 39-year-old man arrested in the Omagh area on Tuesday 27 November by officers investigating the murder was released without charge the same day.
Police investigating the crime conducted a number of searches in the Dromore area of Co Tyrone on Wednesday 28 November. In recent days they have also conducted searches in the Omagh area and Cumbria.
Several items were seized for examination, including a lorry stopped in Milton Keynes.
Mr Kerr was from a nationalist background, brought up in a village near Omagh, and his killing caused revulsion among members of the local community.
Dissident republicans have killed policemen, soldiers and a prison officer as part of their campaign to disrupt the peace process and the threat level in Northern Ireland remains severe.
Damon Hill Wants Government To Help Fund Silverstone
Car was hit by the 09.34 train from Bedford to Bletchley near Lidlington
See the list of local people given New Year's Honours here
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