Police launched a fresh search for the body of a schoolgirl murdered 16 years ago after it emerged that officers failed to act on a tip-off during the original investigation.
Danielle's uncle, Stuart Campbell, was jailed for her kidnap and murder in 2002 - but he's never revealed where he hid her body.
Ground penetrating radar is now being used by Essex Police to scan the garage site in Stifford Clays.
Assistant Chief Constable Steve Worron, head of the SCD, said: "I am pleased with the way the work is progressing on site and as we move in to our second day we will work with a forensic archaeologist to establish where any excavation will be required".
Danielle was last seen on June 18, 2001, at about 8am as she left her home to catch the bus to school.
'To date Stuart Campbell has shown no remorse for his crime and has not told police or Danielle's family where her body is.
On Monday, Danielle's parents visited the site to see the search being carried out.
Police forensic teams search in Grays Essex in 2001 for missing schoolgirl Danielle Jones
They said: 'We are extremely grateful that the police are following up this information and we know they are determined to do whatever they can to find Danielle.
ACC Worron said: 'We received information earlier this year that there had been unusual activity in the garage block around the time of Danielle's disappearance'.
More than 1000 garages were searched between 2001-2002 around the time of Danielle's murder and more than 8500 lines of enquiry were pursued but she was never found.
Worron said: "I do know that in 2001 that garage block had not been searched by officers".
Worron added: "We have remained in contact with Danielle's parents Linda and Tony Jones since Campbell's conviction for her murder and we have updated them on our plans for this search".
"Whatever the outcome from this current enquiry it is important to recognise that Essex Police will continue to follow all credible lines of enquiry and do whatever they can to support the family and resolve this case".
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