A gunman in custody is accused of killing at least eight people who had gathered at the Pittsburgh Tree of Life Synagogue, which is the latest of several houses of worship to suffer violent attacks.

Worshipers at the synagogue in Pittsburgh’s Squirrel Hill neighborhood had reportedly gathered for a bris, a circumcision ceremony for a newborn boy. Several people were killed and six people were injured, including four police officers who were shot as they worked to rescue the people inside the synagogue. Local law enforcement confirmed that they did not find any evidence of explosives.