DENVER — The former neuroscience graduate student accused of killing 12 people in the Colorado movie theater assault sent a package to his university before the attack describing a violent assault, multiple news outlets reported Wednesday.

Citing unnamed law enforcement sources, Fox News’ website reported that shooting suspect James Holmes sent a notebook to the school that sat in a University of Colorado, Denver, mailroom unopened since at least July 12 and wasn’t found until Monday.

Fox said the notebook contained drawings of stick figures being shot and a written description of an upcoming attack. The package containing it was addressed to a psychiatrist at the school, the website reported. It was unclear if Holmes, 24, had had any previous contact with the person. The neuroscience program that he withdrew from on June 10 included professors of psychiatry.

NBC News, also citing unnamed sources, reported that Holmes told investigators to look for the package and that it described killing people.

The FBI and other law enforcement agencies refused to confirm the reports to The Associated Press.

The University of Colorado, Denver, issued a statement saying it could not confirm the reports or discuss any aspects of the investigation, citing a gag order placed on the case by a judge. It said that packages to the main mailroom of the Anschutz Medical Campus, where Holmes studied, are not tracked unless the U.S. Postal Service requires a signature upon delivery.