BOSTON — Major League Baseball says it will investigate allegations the Boston Red Sox illegally used their video replay room to steal signs between opposing pitchers and catchers during their 2018 World Series championship season.

The claims were made Tuesday in a report by The Athletic. The website cited three anonymous sources it said were with the Red Sox during the 2018 season who said some players visited the replay room during games to get information on sign sequences.

Those sources told The Athletic that the Red Sox weren’t able to do it during the postseason because of in-person monitors used by MLB in those games.

The Red Sox said they will cooperate as MLB looks into the allegations.

The latest allegations against the Red Sox come after The Athletic reported last month that the Houston Astros allegedly stole signs during the 2017 World Series.