(NEWSER) – The mother of the American journalist beheaded by ISIS has urged the militant group to free other Americans it has threatened to kill.

"We have never been prouder of our son Jim. He gave his life trying to expose the world to the suffering of the Syrian people," Diane Foley writes in a post at the Free James Foley Facebook group.

"We implore the kidnappers to spare the lives of the remaining hostages," she writes. "Like Jim, they are innocents. They have no control over American government policy in Iraq, Syria, or anywhere in the world."

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Photo by Alice Martins