Prince Albert police have launched an investigation after a shocking and tragic incident at an apartment building downtown.A small child is believed to have been murdered at the Rivercrest apartments on 11th Street.W.Officers were called to the building at noon Wednesday for a two-year-old boy who was reportedly unconscious.He later died at Victoria Hospital.An autopsy Thursday concluded this was a homicide.The Criminal Investigations Division and Forensic teams are involved.Police said there was no threat to public safety at this time.