updated 5/17/2009 1:50:39 PM ET 2009-05-17T17:50:39

Two days after a small boy was found dead, buried in the sand at an Albuquerque playground, investigators focused Sunday on finding the child's relatives.

"We are looking for the person who was the primary caretaker of the child, whether it is a parent, a grandparent or guardian. That's our primary responsibility now," police spokesman John Walsh said.

There were no developments, Walsh said. Police urged anyone with information about the boy to contact them.

A preliminary autopsy on Saturday provided no immediate clues about how the 3- to 5-year-old child died.

The unidentified body was found Friday at Alvarado Park, where a makeshift memorial of stuffed animals, toy trucks and flowers went up over the weekend.

Woman spotted shoe
The investigation began Friday afternoon when a woman who took her children to the city park in Albuquerque spotted part of child's shoe sticking out of the sand. She called police.

Forensic experts with the state's Office of the Medical Investigator told police the boy could not have been dead longer than 48 hours, police spokesman John Walsh said.

Police had received no reports of missing children in the day before the discovery, Albuquerque Police Chief Ray Schultz told a news conference. Schultz said the boy may be from the neighborhood surrounding Alvarado Park but wouldn't elaborate.

"This is one of those cases where I think every minute counts," Schultz said, appealing to the public for help.

Schultz would not say whether there were any wounds on the body.

The boy was wearing a red shirt with the image of a four-wheel drive truck on the front, black nylon pants with red stripes and black shoes.

Copyright 2009 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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