12 h 2 m, 20 abr 1999 año - They reentered the library, perhaps to watch their car bombs detonate, which had been set to explode at noon, but which failed. The library was empty of surviving students except for the unconscious Patrick Ireland and the injured Lisa Kreutz. Once inside, they shot through the west windows at police, who returned fire. Nobody was injured in the exchange. (Cinta de tiempo)