An elderly Swiss couple who saw a picture of the "forest boy" who wandered out of the woods and into Berlin's City Hall claim to be his grandparents, and have submitted to a DNA test to prove it.

A mysterious "forest boy" presented himself at Berlin City Hall two weeks ago. The first words he spoke were English: "I'm alone in the world. I don't know who I am. Please help me." He is believed to be 17, and to have spent the last five years sleeping on the ground in a forest. His identity is a mystery.