Melbourne darts competition erupts into chaos as crowds plastic furniture sent flying in an attempt to build "chair pyramid 'during the final

An international darts tournament at Etihad Stadium erupted into chaos on Saturday evening when crowd members began throwing plastic chairs and tables.

One eyewitness said he travelled to Melbourne from Sydney especially to attend the Darts Invitational Challenge and was shocked and disgusted at the aggressive behaviour.

"It was an absolute mess, drunken idiots that were getting bored and looking for a bit of excitement."

Arsineh Houspian BODY SLAM: Elements of the crowd at Darts Invitational Challenge trashed chairs and tables.

He said people were jumping on the tables until they broke in half and some were body slamming other crowd members.

Security guards tried and failed to defuse the situation, before dozens of riot police entered the stadium.

"It was like a proper riot mentality. The security guards couldn't get a handle on it, it was a real uphill battle for them."

Getty Images CHAIRS TO THAT: Spectators throw plastic chairs during a darts competition in Melbourne

The final of the tournament was temporarily delayed due to the situation.

The eyewitness said when it eventually concluded, the winner - the world number one Michael van Gerwen - seemed unimpressed.

"The look on his face after he won, it was a look not of victory, but one of pure disgust.

Getty Images ACTION OFF THE STAGE: Spectators in fancy dress wrestle during a darts competition in Melbourne.

"I've never seen anything like it. It wasn't good for the sport, it wasn't good for the city's image. I thought it was terrible."

Etihad Stadium communications manager Bill Lane said about 40 fans were ejected from the stadium after the violence erupted and three people were treated by paramedics for minor injuries.

He said prior to any event an assessment is carried out to determine how many security guards will be needed, and 70 were on duty on Saturday night.

Getty Images NEAR-RIOT: Security guards stand around a pile of plastic chairs thrown by spectators

"The night started really well but unfortunately a small minority did behave poorly," he said.

"There'll be a major debrief and we are talking with police and our own security contractor. We won't shy away from what happened and invariably we learn something from every event."

Mr Lane said the venue had an alcohol management plan in place and was only serving mid strength beer, with the bar closed down at the first sign of trouble.

About 40 police were brought in to help restore order.

Crowd member Tim Berzins said there was definitely not enough security at the event.

"Etihad management certainly need to learn from that. It didn't reflect well on the general public of Australia."

Twitter users in the crowd expressed their disappointment.