Congressional members attacked more than 21 times in American history

Congressional members have been attacked at least 21 other times since 1789, according to a report compiled in 2011 by the Congressional Research Service. 

Here are details on many of those incidents:

Rep. Gabrielle Giffords was targeted in a shooting carried out by Jared Lee Loughner, a 22-year-old currently serving life in prison. The incident left six people dead, including John M. Roll, the chief justice for the U.S. District Court for Arizona and a 9-year-old girl, according to The New York Times’ report that day.