Updated at 11:10 p.m. ET
A video has emerged that purports to show militants of the self-declared Islamic State beheading 21 Egyptian Christians kidnapped last week in Libya.
Reuters reports: "In the video, militants in black marched the captives, dressed in orange jump suits, to a beach. They were forced down onto their knees, then beheaded."
Reuters says a caption on the five-minute video reads: "The people of the cross, followers of the hostile Egyptian church."