An online video game that recreates the shooting at Dawson College has upset students at the Montreal post-secondary institution. (CBC)

Montreal police will not charge the creator of an online video game that replicates the shooting rampage at Dawson College that left one student dead and 19 injured four years ago.

Police said nobody could be accused of a crime based on images and content of the game.

Anastasia DeSousa, 18, was killed and 19 other students were injured when a gunman opened fire at the downtown CÉGEP college in September 2006. The gunman killed himself in the school.

The game depicts photos and captions of the shooter, and the object is for players to fire at as many students as possible before police arrive.

When a student in the game is shot, there's a burst of blood and the student goes down screaming.

Dawson students expressed outrage at the insensitivity of the game Tuesday.

A 23-year-old Ontario man who goes by the online name "Virtuaman" created the game, and said he did not mean to cause offence.

Police said the department has asked for the game to be removed because it is not "socially sensitive or moral." But there is no obligation to take the game down.