Additional human remains have been found more than five years after the September 11, 2001, terrorist attack on the World Trade Center.

The remains were discovered yesterday at a Con Edison work location in Chelsea, where authorities believe they were accidentally transferred from the trade center site.

“Con Edison moved some debris from the World Trace Center site to their location at Eleventh Avenue and 29th Street,” a spokesman for the Medical Examiner’s Office, Ellen Borakove, said. “We confirmed they did, in fact, have human remains.”

Ms. Borakove said she did not know how many remains were found, as investigators are still in the preliminary stage of an investigation. It also was unclear when the debris was moved from Lower Manhattan, or who moved it.

A spokesman for Con Edison, Chris Olert, declined to comment on the finding. He said the Chelsea location is used as a work-out station, where employees pick up vehicles and equipment.

Currently, the Medical Examiner’s Office is investigating thousands of remains after 2,749 people died in the trade center attack. The preliminary excavation of the site turned up about 20,000 pieces of human remains, but about 1,150 victims’ remains were never identified.

Active searching for human remains stopped in 2002. In April, the families of victims who died at the trade center were outraged when more than 600 pieces of bone fragments were found on the roof of 130 Liberty St. in Lower Manhattan.

Yesterday’s news elicited a similar reaction.

“This is shocking news,” the executive director of the World Trade Center Families for Proper Burial, Diane Horning, said. “It is a wake-up call for the city and the state,” Mrs. Horning, whose group has lobbied for further searching of human remains at the trade center site and at the Fresh Kills landfill, said. “They can no longer tell us everything that could be done was done, everything that could be found was found. How many more accidental discoveries do we have to go through?”