Major League Baseball's investigation into the Houston Astros' sign-stealing scandal remains underway but no other teams are currently under suspicion, commissioner Rob Manfred told reporters Wednesday.

"I have no reason to believe it extends beyond the Astros at this point in time," Manfred said at the owners meetings in Arlington, Texas, according to Jeff Passan of ESPN.

The league opened an investigation into the 2017 World Series champion Astros last week after reports surfaced that the team used electronic equipment to steal opponents' pitching signs.