MIAMI, August 26 (IslamOnline & News Agencies) - The FBI announced Monday its agents were returning to the Florida site of the first death in a spate of anthrax-by-mail attacks, hoping improved detection techniques will help them track down the culprit.

Saying the investigation should begin Wednesday, August 28, Hector Pesquera, who heads the Miami division of the Federal Bureau of Investigation, said, "We hope the evidence ... will help us bring to justice the person or persons who committed this horrific act."

Looking for the letter or other delivery vehicle that carried the disease and fatally infected a man 10 months ago, Pesquera said the FBI and other investigators would probably need about two weeks to complete the renewed search of the sealed headquarters of the tabloid publisher American Media Inc. in Boca Raton, 60 kilometers (40 miles) north of Miami.

AMI president David Pecker said the building was the same as it was 10 months ago when employees were abruptly evacuated, with untouched coffee cups and family photographs sitting on desks, reports news agencies.

"It's like it's frozen in time," he said.

In investigating how anthrax got into the building, Pesquera stated that, unlike other sites where anthrax hit in 2001, "this is a site where no letter has been found, no delivery vehicle has been found."

Two employees at the building became infected with anthrax last year and photo editor Bob Stevens, 63, died in October, the first person in 25 years to die from the disease in the United States.

Another four people died and a total of 20 were hospitalized in the United States in October and November, after coming into contact with anthrax spores apparently sent by mail.

The anthrax scare, which started only weeks after the September 11 terror attacks, fueled fears of a major bio-terrorist attack.

Pesquera stressed that the Boca Raton investigation was not linked to the case of Steven Hatfill, a scientist who conducted super-secret bio-weapons research for the U.S. military and has been described as a "person of interest" by investigators.

Hatfill, the only person whose name has surfaced in the federal investigation, insists that he is innocent and has cooperated fully in the probe, only to fall victim to leaks that he was a suspect, destroying his reputation and causing him to lose one job and suspended from another.

A medical doctor and germ warfare expert, Hatfill, saying he has filed ethics complaints against Attorney General John Ashcroft and others involved in the investigation, said Sunday, August 25, he had nothing to do with "this terrible anthrax crime" and charged officials with violating Justice Department regulations by leaking information about him and calling him a "person of interest" in the probe.

The FBI has searched Hatfill's house twice. No one has yet to be charged in the anthrax mailings investigations.

Officials said that techniques developed since the AMI building was first searched last year would be used to search for anthrax spores, notably in the mailroom. AMI publishes tabloid newspapers, including the National Enquirer.

Without elaborating on the new techniques to be used, Pesquera said agents would collect "thousands and thousands" of new samples.

The "new tools and techniques will allow for thousands and thousands of samples to be taken that in October would have overwhelmed laboratories," said Dwight Adams, assistant director of the FBI's laboratory division.

Local media said investigators were notably interested in a love letter addressed to actress Jennifer Lopez but sent to the AMI offices. One such letter is believed to have been tossed in the trash and incinerated shortly after it arrived, but investigators believe at least one more was mailed to the publishing house, according to the Palm Beach Post, and believe it is possible a letter that carried the disease into the AMI building is still there.

Should an anthrax-laced letter be found, the handwriting and the spores would be compared with those on similar letters sent last year to the offices of Democratic Senate Majority Leader Tom Daschle and Democratic Senator Patrick Leahy, who heads the Senate Judiciary Committee, officials said Monday.