1. Various of police, hazmat (hazardous material) crews and decontamination tents
2. SOUNDBITE: (English) Sergeant Kimberly Schneider, US Capitol Police:
"I do have some good news to report tonight: we are preparing for re-entry in the Russell Building. The test results have been cleared and all the test results are actually negative, so that's very good news. We are preparing for re-entry right now, and everyone who is in the garage is going to be allowed to go back into the building shortly."
3. People inside parking garage
4. Wide of people leaving garage
5. People walking down street after leaving garage
"There were a lot of senators in there and they were walking around talking to people, and people were doing work and reading reports and a couple of people playing cards, and everyone had cell phones and Blackberries. I was here during 9/11 and that's one thing we didn't have any of that, and everyone was calling people and everyone was positive. I didn't hear a single person complain about it at all, which was really good."
7. Wide of US Senator Bill Frist (Republican - Tennessee) at news conference
8. SOUNDBITE: (English) US Senator Bill Frist, Republican - Tennessee:
"What is different today is, you don't see the panic, you don't see the paralysis, and that's appropriate, and I think that is a real tribute to all the preparation that is under way today."
At least nine senators were among 200 people who were evacuated and held in a Capitol parking garage after a security sensor indicated the presence of a nerve agent in their office building.
Later tests proved negative.
"Test results have been cleared and all test results are negative, so that's very good news," said Capitol Police Sergeant Kimberly Schneider.
The all-clear came three hours after an air-monitoring sensor indicated a suspicious substance in the attic of the Russell Senate Office Building on Wednesday night.
It initially tested positive as a nerve agent.
Lawmakers, aides and other personnel were evacuated to the nearby West Legislative Garage shortly after 18:45 local time (23:45 GMT) as police conducted several other tests before concluding that it was a false alarm.
Police did not immediately know what triggered the alarm, but said it could have been something as innocuous as a cleaning substance.
Senators known to have been in the garage were: John Thune (Republican, South Dakota), Jeff Sessions (Republican, Alabama), Judd Gregg (Republican, New Hampshire), Mike Enzi (Republican, Wyoming), Gordon Smith (Republican, Oregon) Richard Burr (Republican, North Carolina), Larry Craig (Republican, Idaho), Chuck Hagel (Republican, Nebraska), and Christopher Dodd (Democrat, Connecticut).
Senate Majority Leader Bill Frist (Republican, Tennessee) said the evacuation was carried out with a minimum of fuss, and that was different from the past.
In February 2004, the deadly poison ricin was found in Frist's office, and while dozens of Capitol employees were quarantined briefly and decontaminated, none of them became ill.
In October 2001, a month after the terrorist attacks, an anthrax-laced letter shut down Congress briefly and closed the Hart Senate Office Building for months of cleaning.
Five people were killed and 17 sickened nationwide after coming into contact with letters containing anthrax.