WARNING: This story contains a graphic image which may upset some viewers
Facebook users have helped NSW police crack the mystery of a severed "finger or toe" found in a toilet block.
When Harbourside Police were told of the gruesome discovery in Balmoral just before Christmas, they knew something was afoot.
But traditional methods of identification kicked up nothing; there was no victim, no witnesses, no CCTV footage of the toilet block and a finger and toe print check was a dead end.
It was taken to a forensic pathologist who confirmed it was human and that it wasn't a life-threatening injury.
So having few clues to go on, they turned to social media for a helping hand - posting photos of the bathroom stall, the blood-stained ground and part of the severed "finger or toe".
"The injury would appear to have be caused by a rock or something similar whilst possibly swimming or diving [sic]," police said at the time.
"If you have any information or happen to have woken up and noticed a finger missing, or your running gait is a little off, then please contact the station [sic]."
On Friday, the mystery was solved and it turns out the injury was the result of an accident.
Harbourside Police said Facebook users were able to point them in the right direction.
"As a direct result of the post we have now identified the young owner of the "Finger" who unfortunately appears to have got it trapped between the door and the frame, causing the injury. No suspicious circumstances [sic]."