When they return it by showing up is that a pong? :-)
I suspect that Zarqaw has beat it back to Syria for a little R&R.
They have not been seen in a while and both are "Media-whores", their followerss are using them as "Boogey-men" thinking they scare us.
If, however, he IS in Syria, never mind proving it, ask the Mossad to "clean up the mess", so to speak.