The body of a 20-year-old Mount Rainier man was found Sunday floating in a creek outside of Ocean City, Md., with multiple stab wounds and concrete blocks attached to the neck and feet, Maryland state police reported.

They identified the man as John Christopher Planer, 20, of Bunker Hill Road, a draftsman with a Silver Spring engineering firm. Police said they are investigating the death as a homicide, but have neither suspects nor an idea of what the motive was.

Planer's brother, James, said Planer had gone to Salisbury Friday to visit with friends before heading to Ocean City to join his parents for a week's vacation. Planer lived with his parents, his brother said.

"We don't know if he made it to his friends' house," he said. "We have no idea why this happened."

Police said Planer's body, clothed in jeans, was found at about 5:40 p.m. floating face down in Herring Creek in West Ocean City on the western side of Chesapeake Bay, about 100 yards north of Rte. 50. A wallet containing $150 was found on the body and there were multiple stab wounds to the chest, police said.

The body has been taken to Baltimore for autopsy. Results of the autopsy could not be obtained yesterday.

Planer, a graduate of Bladensburg Senior High School and the Maryland Drafting Institute, was employed by Shefferman & Bigelson, a firm specializing in the installation of heating and air conditioning systems.

"It's a shock to everybody. This is so incongruous, knowing the person," said Planer's employer, Sholom Sheffer.