Anne Arundel County Police have started chasing a mystery that has the Chesapeake Bay town of Shady Side talking.

Police were called to the shoreline near Holly Drive and Chesapeake Drive on Wednesday afternoon after somebody discovered human remains. Neighbors say a woman walking her dog saw a dismembered arm.

“At this point the cause and manner of death are unknown and pending autopsy,” said an Anne Arundel County Police news release.

RELATED: Authorities working to ID several decomposed human remains

Neighbor Jane Bowdoin-Babbitt saw at least 30 police officers along with a boat searching the shoreline. She like more information since her grandkids play in a park nearby.

“We’ve never had anything like this and I’ve lived here 22 years,” she said. “I’d like to know if it’s somebody I knew.”

Neighbors tell WUSA9 nobody has disappeared from the town of 5,800. Police say they will release more information when it becomes available.