22/10/2012 13:09 BST | Updated 22/05/2015 10:12 BST

Ben Needham: Dinky Toy Could Hold Clues As To Where Missing Ben Is

Missing Ben Needham: Police hope Dinky toy could reveal where Ben is PA

Police investigating the 1991 disappearance of British toddler Ben Needham on the Greek island of Kos are said to be hoping a toy car could hold the key to finding him.

Ben, who was 21 months old when he went missing, is believed to have been playing with the Dinky toy when he vanished. Now, a UK team of officers are said to be using a super-powered metal detector to search the field where he had been playing.

The Sun reports that it is feared the little boy may have been 'accidentally buried under rubble by builders' in the field 21 years ago.

The metal detector - a magnetometer - can sense fragments dozens of feet underground and could locate a toy, or fasteners on clothes, and cops are pinning their hopes on it finding Ben's metal toy car.

Detective Superintendent Matt Fenwick said: "We are interested in anything - clothing, belt buckles, buttons - that might give us an indication of where Ben was and how far into the field he ventured."

When he went missing, Ben had been in the care of his grandparents who were renovating a house on the Greek island. His mum Kerry was just 19 at the time, but has never give up hope that Ben would be found. Now 40, she has returned to Kos as the police continue the search for her son, but is said to be 'too emotional' to visit the scene of the current investigation.