Odor triggers biohazard alert in D.C.

WASHINGTON -- The nearly empty U.S. Capitol was evacuated Saturday after a sensor detected a possible biohazard in the basement of the building's Senate wing, but the problem turned out to be an industrial solvent.

Capitol Police spokeswoman Jessica Gissebel said field tests came up negative for harmful materials. Samples were being sent to Johns Hopkins University in Baltimore for further analysis, she said.

The building was cleared for reoccupation after hazardous-material teams completed their work.