STILLWATER, Okla. (AP) — Thousands of fans stormed the field and tore down goalposts after Oklahoma State's 44-10 victory over archrival Oklahoma, leaving at least 13 people injured, including two in critical condition, medical authorities said early Sunday.

Michael Authement, who heads the command post at emergency medical provider LifeNet EMS, told The Associated Press that a throng so big took to the field as the game ended that some fans were trampled and one person fell at least 15 feet onto concrete during a wild celebration by Oklahoma State fans.