An estimated 2,000 to 4,000 people attended the annual party on Saturday at an off-campus apartment complex called Campus Crossings at Ram's Pointe.

A woman who identified herself as part of security at the party called 911 asking for more police officers.

Caller: "There was this huge fight. I'm part of security, so we need dispatch here as soon as possible. I know there's a bunch [of officers] outside."

Dispatch: "Where's the fight?"

Caller: "The fight was inside the pool."

Dispatch: "Is it over with?"

Caller: "No, it's not. And I know that all the other cops are busy, so I was just wondering if you guys could get anybody else out here."

Another caller, who also said she worked at Ram's Point, asked 911 to send paramedics to the bathroom where a partygoer was sick.

"I know there's paramedics here, I actually work here, we've got somebody in the bathroom puking. If you could just notify the paramedic as soon as possible," the caller said.

Lt. Russell Reed said 10 officers on the day shift responded to calls for help at the apartment complex, as did 10 to 15 night-shift officers.

Officers cited four people, including two members of the CSU football team. Ten people were treated for injuries and possible alcohol intoxication.

Property management officials said they took measures to proactively manage the security of the event, but that the larger than expected crowd raised concerns and required us to shut down early.

"We regret the outcomes of this event and wish to express our concern for the individuals whose safey was put at risk by those who violated the rules of our welcoming event," Laura Van De Pette said in a statement to 7NEWS.