Gunshots rang out but apparently hit no one after a car struck a protester during a peaceful demonstration in Ferguson, Mo., on the second anniversary of Michael Brown's death.

Witnesses say a car drove into protesters Tuesday night, striking a man so hard that he flew into the air. No one appeared to be shot in the gunfire.

The protest marked two years since the unarmed black 18-year-old Brown was fatally shot by a white police officer.

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In other Ferguson news, a $20 million federal lawsuit filed on behalf of four people arrested during protests following the death of Michael Brown accuses the city of Ferguson and its prosecutors of constitutional violations and malicious prosecution.

The lawsuit was filed Tuesday by the law firm Dowd & Dowd and the nonprofit legal organization Arch City Defenders. It names the city of Ferguson, prosecutors Stephanie Karr and Patrick Chaissang, and police officers.

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