September 4, 1972 - Robert Bowers

On October 27, 2018, a mass shooting occurred at the Tree of Life – Or L'Simcha Congregation synagogue in the Squirrel Hill neighborhood of Pittsburgh, Pennsylvania. The congregation, along with New Light Congregation and Congregation Dor Hadash, which also worshiped in the building, was attacked during Shabbat morning services.

The perpetrator, 46-year-old Robert Gregory Bowers, was shot multiple times by police and arrested at the scene. Bowers had earlier posted antisemitic comments against HIAS (formerly, Hebrew Immigrant Aid Society) on the online alt-tech social network Gab. Dor Hadash had participated in HIAS's National Refugee Shabbat the previous week. Referring to Central American migrant caravans and immigrants, Bowers posted a message on Gab in which he wrote that "HIAS likes to bring invaders in that kill our people. I can't sit by and watch my people get slaughtered.

Content sourced from en.wikipedia.org/wiki/Pittsburgh synagogue shooting under CC BY-SA 4.0.