5.) U.S. Capitol Shooting Gallery
Scrumshus [Public domain], from Wikimedia Commons
In 1954 the United States Capitol Building was subject to a mass shooting, the gunmen were 4 Puerto-Rican pro-Independence protesters. 5 Congressmen were wounded but all eventually recovered. Jimmy Carter would go on to shock many years later when he pardoned all 4 of the gunmen and sent them back to Puerto Rico.
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