Prove it is fake!
That’s not how it works.
All it is at present is an image. It could be of Hamas from 10 years ago. It could be of anywhere else in the Muslim world and have nothing to do with Israel. It wouldn’t be too terribly difficult to stage it in an American or European city.
The only thing that can make a reasonable person accept the image as being what you claim is to provide a provenance and testimony from a credible person as to when and where it was taken.
This similar to the chain of custody required for any kind of evidence.
BTW, asking me to prove it’s fake is asking me to prove a negative. This is quite impossible for anybody.