-LRB- CNN -RRB- -- What appears to be a separated human foot inside a shoe -- possibly the sixth discovered in Canada 's British Columbia in the past 15 months -- has been found on a riverbank , Royal Canadian Mounted Police said Wednesday . Some of the feet found this year washed up on Westham Island , south of Vancouver , British Columbia . The shoe -- a left New Balance running shoe -- was found about 11:30 a.m. Tuesday on the south arm of the Fraser River by a Richmond , British Columbia , couple , police said . It was turned over to the British Columbia Coroners Service for examination and DNA testing , authorities said . Before Tuesday , five feet -- all inside running shoes -- had washed ashore in southern British Columbia since August 2007 . One of them , a right New Balance shoe , was found May 22 on Kirkland Island . That foot was determined to belong to a female , authorities said . View a map of where the feet washed ashore '' The provincial coroners ' office said in July that DNA tests determined that two of the five feet -- a right foot found February 8 and a left foot found June 16 -- were from the same male , but they said they did n't know to whom any of the feet belonged . What was initially thought to be a sixth foot inside a running shoe , found in June , was determined to be a hoax . Authorities said a `` skeletonized animal paw '' was put in the shoe with a sock and packed with dried seaweed . `` Obviously , due to the fact that a hoax was perpetrated previously and then extensively reported on , we want to proceed cautiously -LSB- with Tuesday 's discovery -RSB- until we know what exactly we are dealing with , '' said Constable Annie Linteau , an RCMP spokeswoman . The provincial coroners ' service said in July that the five sets of remains found to that point appeared `` to have naturally separated -LRB- disarticulated -RRB- from the body . '' There was no forensic evidence , such as tool or trauma marks , on the remains to suggest that they had separated in any way other than decomposition , the service said . Authorities are investigating multiple possibilities on the origin of the feet , including foul play and the chance they could belong to victims of a plane crash . Missing persons files are also being reviewed . Four of the five feet discovered between August 2007 and June 2008 were in running shoes made between 2003 and 2004 , and the other was made in 1999 , according to police . Royal Canadian Mounted Police have released photos of the shoes , hoping someone can help identify the remains . Here is a timeline of the discoveries in British Columbia , according to police : August 20 , 2007 The first foot is found by an American man and his 12-year-old daughter boating near Jedidiah Island . The shoe is later identified as a Campus brand running shoe , primarily white with blue mesh , and is believed to be a size 12 . It is determined that it was produced in 2003 and distributed primarily in India . August 26 , 2007 The second foot is found on Gabriola Island by a resident walking on a trail . The shoe is a size 12 men 's Reebok running shoe , primarily white in color . It was produced in 2004 and was distributed globally , though mostly in North America . It was first available March 1 , 2004 , but is no longer available . February 2 A third foot is found by two forest workers on Valdez Island . The shoe is a size 11 blue and white Nike running shoe , made in 2003 and sold in Canada and the United States from February 1 to June 30 , 2003 . May 22 The fourth foot is found on Kirkland Island by a man walking along the shoreline . The size 7 blue and white New Balance running shoe was made in 1999 and distributed in major retail stores . DNA tests later determine that the remains belonged to a female . June 16 A fifth foot is found on Westham Island , in the same type of Nike shoe as the foot found February 2 . DNA tests later determine that both feet belonged to the same male .