Police say they were called to Kurim Avenue in Glenroi at around 2am on January 1 for numerous reasons, including reports that several fights had broken out and noise complaints.

Central West Police District Chief Inspector, Scott Rayner, said this was the "most significant" job to which police in Orange were called during the night and that the incident spilled out onto streets surrounding Kurim Avenue.

"It involved up to 100 people. Not all were involved in fights and scuffles, but there were certainly 100 people congregating and there were a number of fights that broke out," he said.

"There were allegations that missiles in the form of bottles and things were thrown at police vehicles and police officers."

Chief Inspector Rayner said police did not know what was the initial cause for the riot.

Two men were arrested and subsequently charged.

"The first offender, who is 21 years old, was charged with riot, affray and throwing a missile," Chief Inspector Rayner said.

"The second male offender, who is 18, was charged with assault on police, riot and affray."

Both appeared in court on January 1, where they were refused bail.

"The thing we want to hammer home is two arrests have been made, but there will be further arrests made once police continue to identify those involved, which we have progressed well with," Chief Inspector Rayner added.

"There will definitely be further arrests as the days progress."

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