Investigators are embarking on dipping human remains and sifting them from the World Trade Center this week for the first time since the last sifting effort ending in 2010, and two potential human remains were recovered on Monday, according to media reports Wednesday.

About 60 truckloads of debris that could contain tiny fragment of bone or tissue of Sep. 11 victims were unearthed by construction crews working for the WTC. The material is now being analyzed by investigators, in the hope of finding more possible remains in the next 10 weeks. The material is the debris where two potential human remains were found in.

The 2001 terrorist attacks killed 2,750 people at the WTC, but only 1,634 people have been found.

"We have been monitoring the World Trade Center site over time and monitoring the construction," said Ellen Borakove, a spokeswoman for the medical examiner's office. "And if they see any material that could possibly contain human remains, we collect that material."

About 9,000 human remains unearthed from the ruins of the WTC are still too degraded to identify, and are safely stored and monitored by the medical examiner¡¯s office.

However, some families of Sep. 11 victims have been complaining about the dipping and sifting effort.

"Quite frankly, they should've excavated this and searched it 12 years ago," said Diane Horning, whose son, Matthew, died in the attacks. "Instead, they built service roads and construction roads and were more worried about the building and the tourism than they were about the human remains."

The medical examiner¡¯s office said they will continue to closely monitor the site in order to find more human remains to fill the hole in the hearts of Sep. 11 victims¡¯ families.

(Agencies)