Washington State knocked USC from the ranks of the unbeaten Friday night at Martin Stadium in Pullman, Washington, and now a USC player is being investigated for knocking down a fan in the aftermath of the #Pac12AfterDark upset.

According to Theo Lawson of The Spokesman-Review, Trojan redshirt freshman reserve defensive lineman Liam Jimmons was identified by Washington State University Police as the player who knocked over a fan rushing the field following the victory. Jimmons, according to the report, is being investigated for potential assault.

Here's one view of the incident, which takes place at the 0:01 mark of the video on the 20-yard line near the right hash marks.

Posted by Cody Moran on Monday, October 2, 2017

Here's another view of the incident (0:10 mark) from the other side of the field.

Trojans coach Clay Helton was asked about the incident on the Pac-12 coaches teleconference (8:40 mark).

"We're aware of the situation, and internal discipline has been taken," he said. "That discipline will remain in-house."

As for fans rushing the field, Helton didn't seem to take exception to jubilant Cougar fans.

"It was an electric game and a very exciting atmosphere," he said. "The safety of both fans and players always needs to be taken into account. It's a very hard situation in that environment, and I know Washington State does what they can to create a safe environment. It's hard. When you have that many fans and they're that excited, it's hard."

No. 14 USC hosts Oregon State on Saturday night.