The discovery of the poisoned letters led to a brief shutdown of part of the US Capitol building and rattled nerves at the time when officials were also engaged in a hunt for the Boston bombers.

由于发现有毒信件，美国国会大楼部分暂时关闭，而当时警方正在追捕波士顿爆炸者，这令人们越发紧张。

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When Mary Zurhorst Gray was a young girl living in 1920s Washington DC, she used to watch the great dome of the US Congress building, the Capitol, from her home two blocks away.

BBC: When Congress was my friend: Life on old Capitol Hill