俺給總結一下老遊link中的文章大意：

1.Police simply said "teams were yesterday attempting to recover CCTV in the area to establish whether the sighting was credible or not."

2.“None of those [past] sightings have so far proved to be positive and we are actually today [Weds] doing some work on a sighting last night."

 

Conclusion：because the police are still clueless about Du's whereabout, thus, they believed that "somebody in the community is looking after him".