This is a series of shots being kicked around on a Jihad board long ago. The poster was a very fervent follower of AQ in iraq.
They demonstrate rather sickeningly the use of modern technology in the implementation of shariah. We’ve all seen those hangings from cranes, for example.
However, this particular series seems to be faked, and some kind of performance (for money?) in which the arm wasn’t really broken. But the poster certainly believed his material. The boy was supposed to have his arm broken for stealing a loaf of bread.