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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Two men have been arrested on suspicion of manufacturing explosives following a serious assault in Leicester.
Police are urgently appealing for information on the whereabouts of 29-year-old Gemma Newell, who disappeared from hospital.
Northamptonshire Police is shaking things up in a bid to get more officers back on the frontline.