France’s data protection watchdog CNIL is investigating a whistleblower’s claims that Twitter made “egregious” misrepresentations to international regulators about its data security measures, according to a report in POLITICO.

“The CNIL is currently studying the complaint filed to the US Securities and Exchange Commission, the Federal Trade Commission and the US Department of Justice,” the French agency said in a statement Wednesday. “If the accusations are correct, the CNIL could take action leading to legal proceedings or a sanction, if it’s clear there were breaches.”