A massive search operation for a missing 6-year-old boy with autism in a wooded area of northern Germany has gone into its sixth day after a new tactic to help locate the child proved unsuccessful. “Unfortunately, the night did not bring us any progress,” said a police spokesman on Saturday morning in Bremervörde, a town west of Hamburg. Using a so-called “silent strategy,” around 200 German soldiers looked for the boy named Arian in small groups and with night vision equipment. Their search did not turn up any leads. The police said that the new strategy had been discussed with an autism expe…