U.S. law enforcement have reopened the Hart Senate building near the U.S. Capitol after tests on suspicious items showed there was no threat, authorities said on Wednesday.

“All test results were negative” U.S. Capitol Police said over the public announcement system in Senate offices.

Authorities had evacuated parts of the Hart building earlier on Wednesday along with parts of the Russell Senate building, citing concerns about suspicious packages and letters.

The move came amid other suspicious letters to President Barack Obama and Mississippi Senator Roger Wicker on Tuesday that were found to contain the poison ricin.

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