The US Justice Department (DOJ) is set to file a competition lawsuit against entertainment giant Live Nation as early as Thursday, multiple sources familiar with the matter confirmed to the BBC's US partner, CBS News.
Prosecutors are expected to challenge the Ticketmaster parent company's business practices, the sources said.
In many instances, when the DOJ sues over competition issues it seeks to force a firm to split off parts of its business or change how it operates.
The DOJ declined to comment when approached by the BBC. The BBC has also requested comment from Live Nation.
The federal government will be joined in its legal challenge by numerous state attorneys general, CBS News said.
The move comes after an investigation by DOJ's anti-trust division that spanned years. In 2022, CBS News reported that the Justice Department was looking at the company and its Ticketmaster unit.
Live Nation Entertainment was created by the merger in 2010 of US-based events promoter Live Nation and ticket sales and distribution company Ticketmaster.
Live Nation Entertainment has faced growing criticism from fans, lawmakers, artists and competitors.
The company has been accused of having too much influence over live entertainment events in the US and around the world.
In November 2022, Ticketmaster angered Taylor Swift fans when its website crashed during a pre-sale period for the Eras Tour.
After news of the DOJ case was reported, Live Nation's shares fell by more than 6% in after-hours trading in New York.