MEXICO CITY - The search for a 2 1/2 year-old boy who was led away from a market in southern Mexico three weeks ago led police to a horrifying discovery: 23 abducted children being kept at a house and forced to sell trinkets in the street.Prosecutors in Chiapas state said Tuesday that most of the children were between two and 15 years old, but three babies aged between 3 and 20 months were also found during a raid Monday at the house in the colonial city of San Cristobal de las Casas.The search for a little boy who was led away from a market in southern Mexico led police to a horrifying discovery.