(Sherwood, OR)  --  Police in Sherwood say there's no cause for concern after investigating a social media threat hinting at a possible school shooting.  Police say a 12-year-old boy with special needs posted the threatening message to Snapchat yesterday.  Authorities say they received several calls from concerned residents who saw the post.  Law enforcement officials say they spoke to the boy and his parents yesterday and determined that there's no threat to the public.