Charlotte remained on edge Thursday morning after a second night of chaotic protests in the wake of a fatal police shooting that has left lingering tensions in North Carolina's largest city.

A state of emergency was declared just before midnight Wednesday after one person was shot in what police said was protester-on-protester violence. Several other people were injured, and police fired tear gas in an attempt to diffuse the clashes.

Businesses in the downtown began cleaning up Thursday after protesters busted windows and looted some properties, police said. Both the NASCAR Hall of Fame and the United Way reported damage, and major corporations such as Bank of America and Wells Fargo told some employees to work from home as a precaution.

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The North Carolina National Guard arrived at a Charlotte armory early Thursday, and Guard vehicles left the armory about 8 a.m. ET.

The protests were a continuation of anger that boiled over following the death of 43-year-old Keith Lamont Scott, who was shot and killed Tuesday in Charlotte.

Police have said Scott was armed and failed to heed calls to drop his weapon; the victim's family said he was simply holding a book.

A photo taken by a witness and obtained by NBC affiliate WCNC appears to show a gun on the ground near Scott's body moments after the shooting. It's unclear whether the weapon is the same one that police say Scott was holding.