Nikolaos Dakouras, the island's chief of police, said: "We now believe we have searched every possible part of that area, and the boy is not there. It leaves us with a great mystery. We have no theories. We have no solutions." Following a request from UK Prime Minister John Major, the Hellenic Army undertook further searches of the island in January 1993. There have been more than 300 reported sightings of boys matching Ben's description, both on the Greek mainland and on Greek islands. Most were reported shortly after his disappearance during 1991 to 1992. In December 1995, Stratos Bakirtzis, a private investigator, found a blond boy, aged around six years old, living with a Romani family in a camp located in Salonika, Greece. Bakirtzis told Greek TV network ANT1 that the child said he had been "given to the gypsies because his parents did not want him." Police from Veria took the boy into custody and determined he was not Ben Needham. Ioannis Panousis, Veria's chief of police, said the child's birth certificate was authentic and that the child's natural father was currently serving a prison sentence and had left him in the care of the Romani couple. In November 1998, John Cookson saw a blonde boy of about ten playing on a beach in Rhodes. 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. However, DNA testing proved the boy was not Ben, and the Greek boy's family also provided infant photographs to prove he was their child. In October 2003, Ian Crosby made a visit to Kos with Ben's uncle Danny, followed by further visits to meet police from Greece. 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. The Needham family believed that Ben was kidnapped with the intention of selling him for adoption, or that he was taken by child traffickers. 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.