TWO people are dead and multiple others have been injured after a gunman, is still on the run, opened fire at an unsanctioned university Halloween party in Texas, police said.

Emergency services raced to the scene in Greenville, near Dallas, where Texas A&M Commerce College students were celebrating coming back to school following reports about cars being illegally parked along the highway.

9 Bodies are removed from The Party Venue after a shooting in Greenville, Texas Credit: EPA

9 Officers were already at the scene when they heard gunshots ring out Credit: AP:Associated Press

9 Chief Deputy Buddy Oxford of the Hunt County Sheriff's Department told reporters that witnesses are not being cooperative Credit: AP:Associated Press

Police were there for about 15 minutes before they started to hear gunshots - it is not clear if the two incidents are related.

Hunt County Sheriff Randy Meeks said 12 people were shot, two fatally, after a gunman entered The Party Place and starting shooting with a 9mm handgun.

He said a total of 16 people sought medical treatment for various injuries including getting cut by glass while running out of the venue.

Chief Deputy Buddy Oxford told reporters the shooter is still at large.

Mr Oxford said his identity is unknown and there is not clear motive at this time.

He added that a fraternity organised the event and a description of the shooter is not yet available because witnesses are not being cooperative by saying they didn't see anything.

Police originally said the gunman used a rifle but later said the shooter used a 9mm handgun.

9

Mr Meeks said the scene was "completely chaos" as investigators found rifle shell casings that later turned out to be Halloween props.

Both Mr Meeks and Mr Oxford said in separate news conferences that scene was chaotic as hundreds of people starting running out of the building, making it difficult for deputies to locate the shooter.

When the shooting ended, officials said deputies found two people dead inside and more than a dozen others wounded.

The two victims have not been identified yet.

Hunt County Police said three victims were airlifted to a local trauma hospital and other victims were taken to Greenville, Quinlan and Commerce hospitals.

Police did not fire their weapons because they never saw the gunman, Mr Oxford said.

Graphic video shared online shows bodies strewn on the floor in a pool of blood and at least one person receiving CPR as people can be heard screaming the background.

Previous reports suggested anywhere between 10 and 20 people had been injured.

It is thought there were hundreds of students inside The Party Venue at the time of the shooting and more than 100,000 students were at a college American football game earlier that day.

HALLOWEEN HORROR

The event was a Halloween party called #Twerkortreat and was not a sanctioned event by the university - which is 16 miles away from where the shooting happened.

The university said in a statement: "Our thoughts and prayers are with the victims, families, and friends of those affected by this morning's shooting in Greenville, Texas."

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Police responded to reports of illegal parking at 11.30pm local time.

A police scanner reported at least one person was shot in the neck.

Hunt County Police have not made any arrests.

Emergency services respond after two people killed and 20 injured after gunman opened fire at university event in Texas

9 Two people were killed after a shooting at a Halloween party Credit: EPA

9 Police raced to the scene in Greenville, Texas after reports of a shooting Credit: Hunt County

9 Texas shooting - Two people are feared to be dead and at least 20 are injured Credit: Hunt County

9 At least three victims were taken to a trauma hospital by air ambulance Credit: Hunt County

9 The shooting happened at The Party Venue in Greenville, near Dallas

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