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Some Major League Baseball fans have arrived at ballparks this month to find their digital tickets have not only disappeared, but have been resold on popular platforms such as SeatGeek and StubHub.

In a statement acknowledging the problem to The Athletic, the league said that “bad actors” have been able to access fans’ tickets on a platform used by all 30 MLB teams — the Ballpark app — because of passwords scammers obtained or deciphered through other sources.

“The Ballpark app is operating properly and continues to process tickets for millions of fans who attend MLB games. There is no evidence that this was a breach of the MLB system,” the league said. “There have been widespread reports of significant data breaches on other platforms. Bad actors then have utilized leaked or stolen credentials from other websites in efforts to access the accounts of MLB fans.

“We are working tirelessly to address this matter and protect our fans. We want all of our fans to have a great experience when they come to the ballpark and we are sorry that some fans have had to deal with an issue related to their tickets.”