At least nine senators were among 200 people herded into a Capitol parking garage Wednesday night 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 Sgt. 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. It initially tested positive as a nerve agent. Full Story