1. Close up cordoned off crime seen, refocus to medium shot of FBI agents
2. FBI agents dressing into protective clothing
3. Woman walking
4. Sheep being shorn
5. Close up hands of technician using dropper in lab
7. Woman looking into microscope
8. SOUNDBITE: (English) (Part Overlaid) Richard Spertzel, Biochemical weapons specialist: "The delivery aspect of it is much more difficult, requires a lot more intensive knowledge than it does to simply grow the organism."
9. Various microscope images of anthrax cells
10 SOUNDBITE: (English) Richard Spertzel, Biochemical weapons specialist: "The chances, I believe, of being in the wrong place at the wrong time, so that you as an individual is exposed, is really very, very remote."
11. Walk in shot into Emergency room
12. Nurse opens curtain in hospital ward
13. Close up pills being dispensed
14. SOUNDBITE: (English) Dr Alan Zelicoff, Sandia National Laboratory: "Hours make an enormous amount of difference. Certainly a day does."
15. Various of subway system
16. Medium shot nurses and doctors conferring at a table
17. Various of computer screens
18. Various of FBI agents in protective clothing
19. SOUNDBITE: (English) Kyle Olson, ABC News Consultant: "It seems very unlikely that a crackpot would have the skills, and the dedication, and even the finances required for the equipment to produce these materials."
20. Still photo of Bob Stevens who died of anthrax inhalation last week
21. SOUNDBITE: (English) Dr Larry Bush, JFK Medical Center, Florida: "The first look at his spinal fluid was overwhelming. There was a large amount of bacteria in the spinal fluid which is never a good sign. It is a sign of overwhelming infection."
22. Wide shot of Red cross tent and van with people milling around it
23. Medium shot people queuing at red cross tent
24. Medium shot cordoned off office building
25. Medium shot FBI agents
26. SOUNDBITE: (English) Susan Keleher, Colleague of Bob Stevens: "I just don't think that the government was prepared. I'm upset"
27. Wide shot of health department annex
28. Medium shot of people outside annex
29. Close up antibiotic pills in bag
30. Antibiotic pills in bottle
31. SOUNDBITE: (English) Susan Keleher, Colleague of Bob Stevens: "Now I've heard there's not enough ciproflaxin in the county, and we'll have to go elsewhere to obtain the remainder of the supply"
32. SOUNDBITE: (English) Tommy Thompson, U.S. Secretary of Health and Human Services: "On every request we have measured up and been able to respond to the situation in New York, Washington D.C., Pennsylvania and now in Florida."
There is concern across America that the country may already have come under attack from biological weapons.
The scare comes after the death of a Florida man infected by anthrax, and the discovery that one of his colleagues had also been exposed to anthrax spores.
Anthrax is a potentially fatal infection caused by bacteria.
You cannot catch it from someone else. It is most dangerous when it is inhaled. They first symptoms resemble those of a cold, but it can shut down the lungs and cause death.
Anthrax bacteria are common in livestock and are tested in many laboratories.
Turning anthrax into a weapon, on the other hand, is no simple matter.
It is very complicated to take anthrax cells and dry them into particles, called spores.
But anthrax does pose a serious risk.
For one thing, once symptoms of infection show up it is probably too late to treat the infected person.
Anthrax can be treated with common antibiotics, but only if caught early.
U.S. health officials worry that a patient could walk into a clinic and days could pass before anyone realized he was an anthrax victim.
In Washington D.C., the subway system has a secret detecting system to check for biological agents.
In New Mexico, doctors are trying a new Internet system for reporting unusual cases.
Doctors answer simple questions on a computer screen and the state health department is flagged immediately if the symptoms suggest anthrax.
Meanwhile, in Florida, the FBI has been scouring through the offices of the tabloid newspaper where Bob Stevens died from the disease.
Authorities say that the anthrax spores found in Florida don't appear to be natural, but instead of a very crude kind made in a laboratory.
The findings could lead investigators to a specific country or even laboratory.
Whatever the source, the doctor who examined Stevens says he received a huge dose of the Anthrax spores, adding to the theory that he may have received a letter or package at his desk.
Many of Stevens' co-workers expressed outrage at what they said was the slow and inadequate federal government response, waiting four days to seal off the office building after anthrax was confirmed in Stevens.
Employees complain that Federal Health officials have yet to talk to them, cannot tell them the proper dose of antibiotics for their children, and don't even have enough antibiotics for the recommended 60 day treatment period.
But on Tuesday, U.S. Secretary of Health and Human Services, Tommy Thompson, said the U.S. government is fully prepared and there is plenty of medicine available.
Federal officials say they remain baffled by the case, which is described as malicious and most likely criminal, but so far not on a scale that would suggest terrorism.