The investigations follow ongoing reports by Norwegian newspaper Dagens Næringsliv that the music streaming service had inflated its listening numbers of artists such as Beyoncé and Kanye West.

Tidal is now being probed by the Norwegian Authority for Investigation of Economic and Environmental Crime (Okokrim) after having received allegations from Norwegian artist associations claiming potential loss of income from the manipulation of streaming data.

“It has been made known through media coverage that the reports relate to Tidal’s streaming service and a suspicion that someone has manipulated the number of plays of some songs,” Okokrim Attorney Elisabeth Harbo-Lervik said in emailed comments.

Okokrim said it had initiated an investigation to confirm or deny the alleged manipulation, according to Harbo-Lervik, and declined to give any further details on the investigation.

Tidal’s lawyer Fredrik Berg at Fend, an Oslo-based law firm, said that Tidal is not suspected or charged. Berg declined to give any further comments.

Jay-Z acquired Tidal in 2014 in a $56 million deal, to give his peers a greater share of the proceeds from streaming services, which now account for more than half of all U.S. record industry sales. During a presentation in 2015, he introduced fellow artists such as Rihanna and Alicia Keys as co-owners.

The services has failed to rival platforms such as Spotify Technology and Apple Music. In 2017 Sprint acquired a 33% stake, following reports that Tidal was in discussions with Apple about a sale, according to The Wall Street Journal.

In 2015, a year after buying Tidal, Jay-Z sent a letter to previous owners Schibsted ASA, a Norwegian media company, accusing the seller of overstating subscriber numbers at the time of the deal.