Alphabet shares declined 4% on Thursday after the United States Department of Justice (DOJ) filed a motion urging Google to divest its Chrome browser.

This filing is part of an antitrust case aimed at limiting Google’s control over web search access to boost competition among search engines.

The DOJ’s filing is part of a lengthy bipartisan antitrust effort against Google. Its current request seeks to break Google’s stronghold on key internet access points.

The DOJ contends that selling Chrome could create a fairer market for rival search engines.

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