Kaylee Werner was a teenager when a gunman attacked the Tree of Life Synagogue in the US city of Pittsburgh, on October 27, 2018. It was the deadliest attack on the Jewish community in the nation’s history, with 11 people killed and nine injured.

Kaylee, who is Jewish, wasn’t at the synagogue that day, but she bears the scars: one of her relatives was killed, and she was diagnosed with post-traumatic stress disorder. She now campaigns for religious tolerance and gun control.

Ahead of the twentieth anniversary of the UN’s Durban Declaration, considered to be a milestone in the global fight against racism, we look at how the attack has changed Kaylee’s life, and how to combat antisemitism and other form of religious hatred.