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According to numerous media reports, eight people have been taken to area hospitals after being exposed to a mysterious substance on Capitol Hill in the Longworth House Office Building, one of the three office buildings used by the House of Representatives.

Responding fire crews evacuated 10 people in addition to the 8 taken to hospitals.

The entire building has not been evacuated and no other buildings have been evacuated or are on lockdown as of right now.

Authorities have not said what the mysterious substance is or what symptoms those hospitalized are suffering from. The symptoms have been described by one official as “minor”.

Police say the substance was discovered in Suite B-227, the First Call Service Center.

Sources: Washington Post, PZ Feed