Makes we wonder if its feasible to do a stake-out (with a friend of course) inside a vehicle parked across the street and try to figure out where these kids might live, etc. Does your camera motion detect this activity at that distance? If it does, it would be much easier to identify if these kids use this sidewalk on a frequent basis. It looks like you live on a busy street. Is there some type of food mart, 7-Eleven, etc., that these kids might be heading to? Places like that typically have video and could help the local Police in identifying these guys.
Tiger