The Rocky Mountain News reports that Clear Channel Entertainment - the division in charge of concert promotion - is the subject of a "low-profile probe" by the Justice Dept. for possible antitrust violations. New Jersey congressman Robert Andrews requested an investigation in July, the paper says, but DOJ attorneys have been questioning potential witnesses for several months. And while Clear Channel Entertainment spokesperson Rachel Gary told the paper that the company was not aware that there was an ongoing investigation, a "highly placed Clear Channel source" said that the DOJ has had an ongoing, open file on the company. Denver concert promoter Nobody In Particular Presents filed suit against Clear Channel last month, alleging anticompetitive practices.