2. Tilt down senate office buildings in the Hart building
3. Police tape in the Hart Senate office building
4. Shots through the window of Senator Tom Daschle's office
5. Police tape around Senator Daschle's office
6. Officer standing outside Daschle's office
7. Various, line of Senate workers waiting to get tested
8. US House Speaker Dennis Hastert and other congressmen walk to microphones
9. SOUNDBITE: (English) US House Speaker Dennis Hastert
"We just will do a routine, methodical sweeping of buildings. There is no evidence that there is, but because of packages that went through the Senate machines, they did find spore on them, they did find spore that was going through the ventilation system in the Senate, and to give people piece of mind, plus the safety of the members and staff, that we continue to do our work in Congress, we think it's precautionary and prudent to make sure that everything's okay on the House side, as well."
10. Daschle and other delegates descending steps
11. Cutaway, press
12. SOUNDBITE: (English) Tom Daschle, US Senate Majority Leader
"31 people now have had positive nasal swabs. Not all of those are members of my staff, there were some capital police involved. There is a huge difference between a positive nasal swab, which only indicates exposure of course, and infection. There is no evidence, and I want to emphasise this, absolutely no evidence of infection at this point. All of those who have had this positive nasal swab have been on antibiotics now for sometime, and the good news is that everyone will be ok. "
13. Tilt down to wide shot, press
14. SOUNDBITE: (English) Tom Daschle, US Senate Majority Leader
"It is my strong determination, and Senator Lott's as well, that we will not let this stop the work of the Senate. There will be a vote this afternoon. We will be in session and have a vote, or votes, tomorrow, and I am absolutely determined to ensure that the Senate continues to do its work.
15. Setup shot, General John Parker
16. Wide shot, press
17. SOUNDBITE: (English) General John Parker, Head of the Army Medical Research Centre (which examined the anthrax spore)
"This particular strain of anthrax is sensitive to all antibiotics. Penicillin, all the way through ciprofloxin, its a very sensitive strain. We have not identified the strain at this time."
18. Cutaway, press
19. SOUNDBITE: (English) General John Parker, Head of the Army Medical Research Centre (which examined the anthrax spore)
"Its common variety, from all our testing at this point in time."
20. US Health Secretary Tommy Thompson testifying before Senate committee
22. SOUNDBITE (English) US Health and Human Services Secretary Tommy Thompson
"The tests have not been finalised, so I don't want to speculate, but there is no question that this is a very serious attempt at anthrax poisoning."
U-S congressional leaders arranged for an unprecedented shutdown of the House and possibly the Senate on Wednesday after more than two dozen people in Senate Majority Leader Tom Daschle's office tested positive for exposure to a highly potent form of anthrax.
House Speaker Dennis Hastert said lawmakers would go home at the end of the day, and the buildings on one side of the Capitol complex submitted to a "methodical sweeping" to check for evidence of anthrax.
There was no immediate announcement from Senate leaders, as they grappled with the news that numerous aides to Daschle and two Capitol police officers had tested positive for exposure after being in the vicinity of an anthrax-laced letter opened in the senator's office.
Hastert said lawmakers and staff would be sent home to allow health officials to conduct tests through the capitol complex, where more than 20-thousand people work.
Five weeks after the worst terrorist strikes in U-S history killed more than five-thousand people in New York and Washington, the discovery only added to anxiety in the United States.
Three government sources, all speaking on condition of anonymity, said preliminary testing indicated the anthrax found in Daschle's office had been refined enough so that it could be easily dispersed through the air.
One said the anthrax was in a purified form.
US Senate Majority leader Tom Daschle confirmed on Wednesday that 31 people had tested positively for exposure to the anthrax virus after being in the vicinity of an anthrax-laced letter opened in the senator's office on Monday.
Daschle emphasised the nasal swab tests carried out only demonstrated exposure to the virus and not infection.
But he said the Senate would continue with its work.
Senate Republican Leader Trent Lott said that the decision to carry on with work at the Senate, albeit with safety precautions, was the right one in the circumstances.
And General John Parker, head of the army medical research centre responsible for examining the spore sent to Daschle said the strain of anthrax was sensitive to all antibiotics.
He also said that the strain was of a common variety, although it is yet to be specifically identified.
At a hearing before a Senate committee, Health Secretary Tommy Thompson said more than 20 people had tested positive for exposure.
Asked about the particular strain in the Daschle letter, Thompson said it was a "very serious attempt at anthrax poisoning."