Detective Chief Inspector Niel Jamieson from West Mercia Police says it is still unclear why Ceri Fuller took the lives of his children.
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Latest figures obtained under the Freedom of Information Act show these banned dogs were among around 3,000 of the breed present Britain.
Police revealed yesterday the man demanded officers fix his broken loo and turn off the water mains in his distressed call on Friday.
A 21-year-old girl from Tamworth has died after taking the contraceptive pill, according to her parents.