Eyewitnesses say that police hunting for a man suspected of killing an off-duty officer are searching an area near to the village green at Writtle, Chelmsford, amid reports that a body has been found.
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The force has been tweeting after carrying out a series of dawn raids.
Adenike Akingbogun made the dangerous manoeuvre after ignoring the crossing lights and driving onto the tracks.
Police arrived at the 73-year-old's home after Alfie chased a delivery man.