PITTSBURGH (AP) — President Joe Biden on Sunday marked the sixth anniversary of a gunman’s deadly attack on a Pittsburgh synagogue and called out what he called an “appalling surge of antisemitism” amid the war in Gaza.

The 2018 attack claimed the lives of 11 worshippers from Dor Hadash, New Light and Tree of Life congregations, which shared space in the synagogue in Squirrel Hill, the heart of Pittsburgh’s Jewish community. Two worshippers and five responding police officers were also injured in the attack, the deadliest act of antisemitism in U.S. history.