Human remains - some as large as arm or leg bones - have been found at the site of the 11 September attacks in New York, AP news agency has reported. The remains were found in rubble excavated from a manhole near the site of the World Trade Center. Relatives say the find proves the need for a thorough new search of the area around Ground Zero. "We can no longer rely on accidental discoveries," said WTC Families for Proper Burial in a statement. "This must be a deliberate search. May this awful news be the catalyst needed to go back and do the job well." Families of more than 1,100 of the victims of 9/11 have never received any remains of their loved ones. The campaign group is to hold a news conference over the latest discovery later on Friday.