New York Attorney General Letitia James announced Thursday her office was reviewing the limits on trading put in place by the app Robinhood after users drove stocks like GameStop and AMC to record-setting highs.

“We are aware of concerns raised regarding activity on the Robinhood app, including trading related to the GameStop stock," James said. "We are reviewing this matter."

Social media users and retail investors flocked to the basement-dwelling stocks in recent weeks, inflating the companies' market value in the process at the expense of hedge funds that had bet against the companies.

The app Robinhood, which allows commission-free trades, put limits on trades amid the volatility, leading to an outcry.