Washington, DC Attorney General Karl Racine has filed an antitrust lawsuit against Amazon, claiming the company has raised prices unfairly and illegally maintained monopoly power.

"Today, my office filed an antitrust lawsuit against Amazon for illegally abusing and maintaining its monopoly power by controlling prices across the online retail market and violating DC law," Racine wrote on Twitter.

Third-party sellers who operate on Amazon's Marketplace need to adhere to the company's business solutions agreement. In 2019, amid antitrust regulators looking into the issue, Amazon removed a provision that banned sellers from offering their products at a lower price on rival marketplaces.

However, according to the suit, Amazon added an almost-identical clause to the agreement. Under that Fair Pricing Policy, Amazon can impose sanctions on sellers that hawk their wares for less money elsewhere.