Investigators for Major League Baseball (MLB) determined that the Boston Red Sox used an Apple Watch to steal hand signals from the New York Yankees.
Sign stealing has been a part of the game for awhile, but using electronic devices to do it is against the rules.
The New York Times reported that the MLB probe began when Yankees general manager Brian Cashman filed a complaint with the commissioner's office that included video.
MLB Commissioner Rob Manfred said the Red Sox have been very cooperative with the league's investigation.
The Red Sox, according to The Times, "admitted that their trainers had received signals from video replay personnel and then relayed that information to some players—an operation that had been in place for at least several weeks."
The team, however, told investigators that Boston manager John Farrell, general Dave Dombrowski and other team executives did not know about the sign stealing operation.
On Tuesday, the Red Sox filed a complaint against the Yankees, claiming the club used a camera from its YES television network to steal signs as well. But Yankees manager Joe Girardi quickly shut that idea down.
Manfred said he wants to resolve the issue as quickly as possible, but didn't comment on possible penalites.
"The only thing that I can tell you about repercussions is that to the extent that there was a violation on either side — and I'm not saying that there was — to the extent that there was a violation on either side, we are 100 percent comfortable that it is not an ongoing issue — that if it happened, it is no longer happening," he said.
The Associated Press contributed to this report.