Can this be verified? Militants could have done it themselves. Though it may be a sin, they could have prayed and done it in the name of Allah that it is for a 'good cause'. The cause being, get Muslims to get angry at the infidels. I'm not necessarily saying it is true. I am sure similar atrocities are occurring in Guatonomo Bay, Iraq, Palestine, Israel, etc.

Who tore them?

astagfirullah!