Kardashian tweeted, "praying for everyone in Israel," in response to Friday's violence.
Dozens of her 17 million Twitter followers tweeted threatening posts in response, some of them anti-Semitic, The Hollywood Reporter said.
"Kill yourself," one wrote, while another said "Die in HELL!"
Other tweets included:
"You are a disgrace to your people and your ancestors."
"Further enhancing your reputation as a dumb porn star."
"Israel will be destroyed along with all the Jews who cursed RT."
Kardashian followed her first tweet with a second, saying "And praying for everyone in Palestine and across the world!"
She eventually removed both messages.