Christian Malik Pryor, a walk-on wide receiver at Fresno State, was arrested Monday afternoon after authorities learned of his mass shooting threat which was identified through an anonymous post on the social media app, Yik Yak.

Pryor was arrested soon after the post went live and admitted to communicating the threat.

According to the Fresno Bee, Pryor’s post, which included a photo of the university’s library, read:

“The time is here. @3PM I will release my frustrations. Tired of dirty looks, get rejected, nd being talked about bc how I dress. My choice of weapon M4 Carbine…”

Yahoo! Sports reported that students learned of the violent threat through the university’s Twitter account. Police located Pryor by tracking his IP address.

Fresno Police and the FBI are investigating. Pryor has not appeared in any games this season according to the school’s official athletics site.