Florida Attorney General James Uthmeier launched a criminal investigation into the online gaming platform Roblox, calling it “a breeding ground for child predators.”

The criminal investigation follows a civil subpoena that Uthmeier’s office issued to Roblox in April over its child protection policies. Uthmeier said in an interview on Fox & Friends that his office found evidence that Roblox has been “operating in a careless way” and alleged that the company is aware child predators have used their platform.