Investigators are sifting through newly uncovered debris from the World Trade Center for the first time in three years, hoping more victims might be identified after tens of millions have been spent on the painstaking identification process.

Aerial view of Ground Zero (Getty Images)

About 60 truckloads of debris that could contain tiny human bone fragments have been unearthed by construction crews working on the new World Trade Center tower in recent years. That material is now being transported to a park built on top of the former Fresh Kills landfill on Staten Island.

City officials say investigators will spend 10 weeks attempting to identify the remains. The city's last sifting effort ended in 2010.

Some 2,750 people died at the World Trade Center in the 2001 terrorist attacks, but only 1,634 people have been identified.

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