[lonevoice]

ISIS has doubled down and now triple downed on this claim. Maybe next they'll quadruple down, oh noes!

If ISIS had anything that would prove this claim, they would have produced it by now. There's nothing but upside for them to prove it's true. I'd guess that means they can't prove it because it isn't true.

[ladyjane]

Maybe ISIS wants the FBI to keep lying.

Then they will post the video.