Police in Edmonton are investigating after a human head was found in an alley.
   
A source says a woman made the gruesome discovery in a northeast neighbourhood.
   
RCMP are working with city police to determine whether the head is linked to remains found in a ditch near Ranfurly, east of Edmonton, on the weekend.
   
Local media have quoted area residents who heard the body was decapitated and lying in a ditch next to a running pickup truck.