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Senate office building evacuated
A U.S. Senate office building was evacuated after a sensor detected the presence of a possible nerve agent, sources said.
However, a second test came back negative.
Eight senators and more than 200 staffers were evacuated after alarms sounded at 7 p.m. in the attic of the Russell Senate Office Building, located just north of the Capitol, Senate aides said.
They have been quarantined in an underground parking garage next to the building, said Eileen McMenamin, a spokeswoman for Sen. John McCain.
McMenamin said police have ordered those evacuated to remain in the parking lot until additional tests are complete.
According to the Agency for Toxic Substances and Disease Registry, "Nerve agents are the most toxic of the known chemical warfare agents."
Senate building evacuated after powder found
WASHINGTON - A Capitol office building was evacuated Wednesday night on a hazardous substance alert after police discovered a suspicious powder in its attic, authorities said.
The Homeland Security Department was investigating the alarm, but a senior counterterror official said it did not immediately appear to be an emergency.
Hazardous material teams were headed to the Russell Senate Office Building. U.S. Capitol Police were leading the response.