This report from yesterday is about Eric Breininger and Houssain al Malla, apparently not aboard the KLM aircraft, but believed to have entered Germany after recording videos proclaiming their intention to suicide attack.
On Tues or Weds, the major airport in Pakistan was shut down for security reasons. The next day, Britain shut down all flights to and from Pakistan. Yesterday, all flights at British major airports were grounded for several hours(first, supposedly on orders from air traffic control because of overcrowded skies, later explained as a a "computer glitch"). In other words, these guys are out there, headed for some European country, and it is vital to catch them before they get there.