Investigators are intrigued by the fact that Hatfill lived for years near a Greendale Elementary School while attending medical school in Zimbabwe, ABCNEWS has reported. Greendale School was the phony return address used in the anthrax letters.
However, Glasberg denied Hatfill knew of such a school in Harare, Zimbabwe.
"There is a subdivision in Harare called Greendale, [but Hatfill] did not live there," Glasberg said. "The information we have is that there is no such Greendale School."
Since the wave of attacks, the FBI has been unable to find out who was behind the anthrax-laced letters. There have been few leads and investigators have admitted that the trail seemed to have grown cold.
Fort Detrick, which also is home to the U.S. Army Medical Research Institute of Infectious Diseases, has anthrax samples, and the FBI is conducting voluntary lie detector tests at the base. Lie detector tests and interviews are also being conducted at Dugway Proving Ground in Utah, where researchers have been developing a powdered form of anthrax for testing biological defense systems.
Small quantities of anthrax have routinely been produced at Dugway, and then shipped to the Army's bio-defense center at Fort Detrick, Army officials have said.
ABCNEWS' Barry Serafin, Pierre Thomas and Brian Ross contributed to this report.