According to the Times report, the Red Sox also filed a counter-complaint accusing the Yankees of similar electronic sign-stealing measures, using cameras from the Yankees' YES Network.
The commissioner's office then confronted the Red Sox, who admitted that their trainers had received signals from video replay personnel and then relayed that information to some players.
An industry source also indicated that the Red Sox were aware of that particular camera angle being used by the New York Yankees at least one other time, but that this time they had captured the images forwarded to the commissioner's office.
While sign-stealing - mostly by base runners on second base, who have a mostly unfettered view of the catcher - has been an accepted part of baseball gamesmanship for decades, it has caused occasional rifts when the practice becomes too obvious.
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The NY Times said the Red Sox told Major League Baseball investigators that club personnel watched monitors and then electronically sent pitch signals to team trainers in the dugout, who relayed the information to players. However there are rules against the use of electronic equipment, which is what league investigator Bryan Seeley will have to take into consideration as he works this case.
"I think there was something that was suspected of going on", Yankees outfielder Brett Gardner said before Tuesday night's game in Baltimore.
Dombrowski said it was the first time a team he'd worked for had been formally accused of stealing signs.
In Boston, the Herald went a bit easier on the Sox, employing an Apple Watch graphic and spinning the scandal as evidence this Red Sox team is "flawed".
"No, I don't", Dombrowski said.
"Obviously I played against the Yankees for 11 years".