For little information that is available it appears to be the following:
1) Vueling pilots loose contact with ATC on handover from Brussels airspace.
2) Vueling pilots regain contact with Amsterdam controllers but by now F16s are already on route.
3) About a minute later F16 appear outside the cockpit window and the pilot of the Vueling plane in his shock uses the unfortunate frase to ATC: "are we being hijacked".
4) Plane remains in contact with ATC and finally lands at the remote runway at Schiphol.
5) Plane sits at the moment on the runway waiting for thorough inspection (I hope they are gentile).
Again this it what it appears to be. The story might have been different. However the wording from the pilot to ATC in number 3 was like that and was the reason for continued alert phase at Schiphol... to be continued...