Zero Day (2003) is a movie directed by Ben Coccio, about a school shooting much along the lines of the Columbine High school massacre.
The film begins with the introduction of Andre and Cal and their general plan to assault their school. The majority of the film depicts the boys planning, preparing, and explaining some of their motives. There are also other scenes such as the boys at a party, egging the house of someone they dislike, and Cal going to the prom while Andre works at a pizza place.
The final scenes of the movie show the boys arriving at school on May 1 and preparing their weapons in the car. They then run into the school, armed with three pistols, a Ruger GP-100 .357, a Glock 17, a M1911 pistol, a M1 Carbine, a 12-gauge pump action shotgun, and at least twenty pipe bombs. The entire shooting is shown through the eyes of security cameras. Like Eric Harris and Dylan Klebold, on whom Andre and Cal are based, they commit suicide after the shootings.
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 have been set up. The youths reveal that Andre and Cal killed 12 students and themselves. They find Andre and Cal's crosses and set them on fire before running back to the car. The last scene shows the two crosses on fire before cutting to the credits.