MIAMI (CBS SF) — A cellphone video clip posted by a football fan captured some serious unsportsmanlike conduct during Sunday’s 49ers game against the Miami Dolphins.

A cellphone camera was rolling the minute the taunting between two Dolphins and two Niners fans transformed into an all-out brawl Sunday afternoon.

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YouTube user Jack Snyder posted the clip, saying fight broke out in Section 334 at Hard Rock Stadium.

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Witnesses said it started when the man in the Dolphins jersey started yelling derogatory remarks about Colin Kaepernick. Words are exchanged before the Dolphins fan takes a swing at one of the 49ers fans.

Other fans tried to stop the melee, but ended up getting caught in the middle.

The clip goes on for just under a minute and 45 seconds before the fight appears wind down. Stadium security does not seem to get involved from what is shown in the video.

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Dolphins team officials are now looking into the incident.