The basement of a building in New York City's SoHo neighborhood continues to be a hive of activity as investigators look for any clues in the 1979 disappearance of a 6-year-old boy.

Milk cartons with Etan Patz's picture
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FBI officials were at the scene Sunday looking for any traces of Etan Patz. They've been digging up the floor and removing drywall for days.

Forensic teams have been breaking up the floor with jackhammers and passing the rubble out by hand.

Authorities say they began the search after an FBI dog indicated the scent of human remains in the room.

Etan was on his way to his school bus stop when he disappeared. He would have passed the stairwell leading to the basement during his walk.

(Copyright 2012 by The Associated Press.  All Rights Reserved.)

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