FBI agents have searched a wildlife refuge along the Jersey Shore as they investigate the decades-old disappearance of two boys who were roommates at a state facility for children with developmental disabilities.

The search of the Edwin B. Forsythe National Wildlife Refuge comes as investigators refocus their efforts on the 1975 disappearance of 12-year-old David Williams, of Newark, and 17-year-old Steven Anderson, of Westville. The boys apparently wandered into the woods surrounding what is today the New Lisbon Developmental Center. They were never seen again.

FBI officials said they had promising new information in the case but declined to elaborate. The boys were added to the Kidnapping/Missing Persons section of the FBI’s website in October.

Multiple law enforcement agencies converged on the wildlife refuge Tuesday near Mayetta Landing Road.

Officials have not said if anything was found during the search.

Anyone who may have any information about the boys’ disappearances are asked to contact the FBI Atlantic City office at 609-677-6400.