Apple shares are down.

Apple (AAPL) shares fell 4% after the Justice Department filed an antitrust lawsuit against the iPhone maker.

The lawsuit accuses Apple of maintaining an illegal monopoly on smartphones by blocking competitors' access to the hardware and software features of its devices.

Apple said in a statement shortly after the lawsuit was filed: “We believe this lawsuit is inconsistent with the facts and the law, and we will vigorously defend against it.”

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