Thames Valley Police have said that forensic scientists are still searching for "evidence of Jayden in a cemetery and in a particular grave".
In a video uploaded to YouTube, Detective Chief Superintendent Andy Murray said that it was a "slow and meticulous process" and that scientists would remain there "if necessary, all night".
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The officer fired after the boy, who is being treated in hospital, failed to raise his hands when told to.
A pair of cyclists made the shocking discovery of a baby at the bottom of a drain in Australia.
A weather warning is in place across the south-east with heavy rainfall expected. Elsewhere there will be plenty of sunshine around.