"A referee was shot by a cannon during a Maine Maritime Academy football game"

WGME:

It’s academy tradition to sound off a cannon using a blank shotgun shell whenever the team scores, according to the sheriff’s office. But authorities said an alumnus of the school who brought his own cannon to Saturday’s homecoming game

...

The incident was captured on video and posted online by local media.

It happened a few months ago, but charges have been filed:

He will face criminal charges of aggravated assault, reckless conduct with a firearm and possessing or discharging a firearm on school property