Both this report
and this one
cite the SITE institute as claiming they have a statement that was posted to the Internet by AQAP claiming responsibility for the attack on Muhammad bin Nayif. When I read the reports I was surprised at the quick turn around, as AQAP doesn't usually post claims of responsibility within hours of an attack - it is usually days. So, I got some coffee and fired up the forums, but I have been unable to find the statement on any of them.
So, my question to our vast readership is: am I alone in not being able to find the statement or did SITE jump the gun? I expect there to be a statement at some point, I just haven't found it yet.