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Screengrap from the video published to the Internet on Sunday, purportedly from terror group ISIS, militants claim to have beheaded American hostage Peter Kassig. The video shows the aftermath of a beheading, in which the victim is not clearly recognizable. CNN has not been able to confirm the authenticity of the video nor the identity of the victim.
Screengrap from the video published to the Internet on Sunday, purportedly from terror group ISIS, militants claim to have beheaded American hostage Peter Kassig. The video shows the aftermath of a beheading, in which the victim is not clearly recognizable. CNN has not been able to confirm the authenticity of the video nor the identity of the victim.

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Tech firms resisting free anti-extremist algorithm

CNN's Jake Tapper speaks with Professor Hany Farid, who says his algorithm can detect and remove potentially terrorist content on social media.

Tech firms resisting free anti-extremist algorithm

CNN's Jake Tapper speaks with Professor Hany Farid, who says his algorithm can detect and remove potentially terrorist content on social media.