A human’s severed leg bone inside a rubber boot was found in the shore in Carlsbad early Wednesday and police were searching the beach for any other remains.

Police had no clues as to where the body part came from or where the rest of the person might be.

A man who was bicycling on the beach along the water’s edge, off Ocean Street near Oak Avenue, north of Carlsbad State Beach, made the gruesome find, Carlsbad police Lt. Greg Koran said.

The cyclist noticed the boot in the water and stopped to pull it out. He saw a bone inside, thinking it might be a human bone, called police about 3:30 a.m., Koran said.

Officers agreed that it appeared to be a human’s lower leg bone and took it to the county Medical Examiner’s Office for investigation.

Koran said officers searched the beach for nearly half mile in each direction in case there were other remains. They resumed the search after sunrise with help from Oceanside harbor police in a boat.

Koran said the black rubber boot might be a type worn aboard a boat, but there was no immediate evidence to confirm where the person had been.