KIBBUTZ MEFLASIM, Israel (AP) — When Hamas fighters invaded southern Israel on Oct. 7, the militant group that rules the Gaza Strip perpetrated the deadliest attack on Jews since the Holocaust.

So this year’s Holocaust Remembrance Day, which begins Sunday evening in Israel, carries a heavier weight than usual for many Jews around the world.

For Judith Tzamir, a Holocaust survivor from Germany who moved to Israel in 1964, the horrors of Oct. 7 prompted her to mark the somber holiday by making a pilgrimage she has long avoided: She will visit Auschwitz, the Nazi concentration camp in Poland.

Tzamir, whose kibbutz fended off Hamas attackers Oct. 7, will join 55 other Holocaust survivors from around the world and about 10,000 others participating in the March of the Living. The event recreates the two-mile (three-kilometer) march from Auschwitz to Birkenau, where approximately 1 million Jews were killed by Nazi Germany.