According to Inspector Jon Cousins, these findings further strengthen the theory according to which Ben was killed the day he disappeared and is buried in Kos.
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Excavations were focused around a tree, apparently planted since Ben vanished.
Cookson said that the child was known as 'the blond one' by his friends and was the only fair haired child in the group of dark haired Greek children.
Suspicious, he took photographs of the children and used the pretext of tousling the boy's head to acquire a hair sample for DNA analysis.
Crosby has also investigated a photograph, sent to him by a holidaymaker who visited Turkey in 1999, which depicts a number of Turkish village children, including a blonde boy who resembles the age progression photo of what Ben might look like aged 13.
Carol Sarler, writing in The Times in 2007, said: "I have repeatedly asked police and press, British and Greek, for a single example to support this rumour. When pretty little Western European kiddies go missing...