Survivors Not Shown: Science Fiction

The killer stabbed them, and then jumped off the tower to his death, the news reports all said. The premier extended his great sympathies to their families and offered wishes for their full recovery, those who had lived past the first few minutes. Three dead, and two in the hospital. What the news reports didn't mention was that the bodies of the dead had been covered up within minutes and whisked out of sight, so that nobody could see what happened to them after they died. What the news reports also didn't mention was that the hospital the two survivors had been taken to was a military facility, and that--

Inspiration: http://www.cnn.com/2008/WORLD/asiapcf/08/09/olympics.murder/index.html
Story Potential: Medium.
Notes: Nothing super-appealing, but nothing wrong with it as a story concept either.