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 killed eleven people and wounded six, in the deadliest attack on a local Jewish community in American history.