by Cutter Hicks, Sports 1140 KHTK

Video captured by cell phones showed the female security guard attacking a fan at the Oakland-Alameda County Coliseum during Monday night’s game between the Oakland Athletics and the San Francisco Giants.

According to CBS SF Bay Area in the video above, a fan tweeted that the security guard “came in hot and bothered. And seemed to have started a fight with an entire row. Random.”

The Oakland Athletics announced there will be an investigation into an incident.