Officials in New York say workers have discovered more human remains in abandoned tunnels beneath the World Trade Center site following last week's discovery of bones in the same area.
The Medical Examiner's office says 18 pieces of bone and personal items were found Sunday. The manholes, which had not been searched before, are under the site of the twin towers destroyed in the September 11, 2001 terrorist attacks.
New York Mayor Michael Bloomberg ordered the tunnels searched after utility workers came across scores of human bones last Thursday. The tunnels had been sealed since 2002 for construction purposes.
No physical remains have been identified for nearly half of the 2,749 people killed in the terrorist attacks in New York.
Some family members of the victims have expressed outrage that the area under the World Trade Center were sealed without being searched.
Earlier this year, hundreds of human bone fragments were found on the roof of a nearby building that was badly damaged in the attacks.