Given the task definition and input, reply with output. In this task, five ordered key facts are given. All the given facts are expressed in natural language. Your job is to generate a story 100 to 1000 words long, that includes all the facts given as input in their order of appearance while expanding upon them to produce a broader, yet coherent, narrative.

Fact1: Andre Kriegman and Calvin Gabriel based on Dylan Klebold announce intention to attack high school calling, Fact2: Andre works at pizza place, Fact3: Cal and Andre planned to attack on first day, Fact4: boys preparing plan and weapons in Andre 's car, Fact5: pair After decide shoot themselves arguing over whether to engage police in gunfire
Andre Kriegman based on Eric Harris and Calvin Gabriel based on Dylan Klebold announce their intention to attack their high school, calling their plan Zero Day. They keep a video diary on the camera, carefully hiding it from their friends and families. The majority of the film is portrayed through their video filming, and shows them planning, preparing, and explaining some of their motives. Other scenes show the two attending Andres birthday party, egging the house of someone they dislike, and Cal going to the prom while Andre works at a pizza place. In one video entry, Cal notes the origin of the name Zero Day: Cal and Andre originally planned to attack on the first day on which the temperature dropped to zero degrees after they had finished their preparations. This plan soon proved impractical, and they set May 1, 2001 as the new date. Wanting their attack to have a memorable name, they agreed to keep the original title. The second to last scene of the movie show the boys arriving at school on May 1 and preparing their plan and weapons in Andres car. Andre says that he could never have carried out Zero Day without Cals help, a sentiment Cal echoes. They run into the school, armed with three pistols, an M1 carbine, and a 12gauge pumpaction shotgun, all stolen from Andres father and cousin. The shooting is shown through the viewpoint of security cameras very similar to Columbine High School massacres view. The dialogue is heard via the cellphone of a student who is shot and killed. Shooting at anyone they see, Andre and Cal eventually see law enforcement arriving in force after sixteen minutes of shooting. After arguing over whether to engage the police in gunfire, the pair decide to count to three and shoot themselves. The next scene is set on May 10, nine days after the shooting. A group of youths film themselves going to a park where memorial crosses are standing. They say that Andre and Cal killed twelve students and themselves. Finding crosses for the pair, they set them on fire and run back to their cars. The last scene shows the two crosses burning.