http://www.islam-watch.org/Others/Sexual-Terror-Untold-Stories-of-Beslan-Jihad.htm
But you said FACTUAL basis, and you mean something special.
If you require the Department of Rape to give a notarized confirmation of rape at Beslan, then I, too, will have to disappoint you.
Not looking for notarized confirmation, just looking for some evidence like victims/families/authorities alluding to sexual assault.
Beslan is a critical topic, and one that needs to be shared (I believe) because it is a tactic that will be used again on a larger scale.
When I discuss it with people I want to be accurate so I do not lose credibility.