NEW YORK CITY, New York- The long mystery of the disappearance of a little boy in New York City is still a mystery.

Authorities say no obvious signs of human remains were found in a basemen being search in connection with the 1979 disappearance of 6-year-old Etan Patz.

The FBI said on Monday morning that agents had finished their work at the site in Manhattan.

A police spokesperson says the case remains a missing-person investigation.