Police have launched a probe after a man’s finger was dropped through a family’s letter box in Sussex, England, last month.

The family “reeled in horror” after the severed finger was dropped through the door Sept.10. Investigation revealed that the finger was chopped off five days before it was posted. Police were looking at tracing the man whose finger was cut off. No information about the man was available and it was not known whether he was dead or alive.

Confirming the incident to the Sun on Tuesday, a police spokesperson said they were “investigating an incident where a fingertip was posted through a letterbox in Bognor Regis on Tuesday, Sept. 10. Inquiries have been generated including checking of CCTV in the area, and inquiries with hospitals. At this time the casualty remains unidentified, but the investigation continues.”

Calling it an “unusual and isolated incident,” Chichester and Arun District Commander, Chief Inspector Jon Carter, said, “While we accept it may be alarming, I would like to reassure people there have been no reports of similar incidents in the area.”

“There is no evidence to suggest that this is part of criminal activity, or that any person has been targeted,” he added.

Meanwhile, a source told the tabloid, “The police are concerned that serious harm has come to the person whose finger was posted through the letterbox. It was a terrible thing for that family to find on the inside of their front door. They reeled in horror after finding out what the object was. The householders do not appear to have any enemies. It is a total mystery.

“Police are unsure whether this was a prank by someone with access to bodies, such as a mortuary worker or undertaker, or something more sinister,” the source added.

UK Police Tape
In this image, a police tape is photographed in Chester, United Kingdom, July 4, 2018. Christopher Furlong/Getty Images