Authorities responded to calls of an lively shooter Thursday night on the Boulevard Mall in Las Vegas.
Deputy Chief Chris Jones said a video was obtained showing the armed person.
The Las Vegas Metropolitan Police Department tweeted that there are no reports of injuries or shots fired at this time, and asked people to avoid the area.
Multiple police cars and ambulances surrounded the mall.
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Police have descended on a Las Vegas mall in a suspected shooting situation.
Authorities in Las Vegas on Thursday said there was no threat to the public after an earlier massive police response at a mall after reports of a person with a gun.
A few hours later, a law enforcement official familiar with the investigation told CNN a suspect had been arrested, but did not provide additional details.
Thursday's incident came less than eight months after a gunman massacred 58 people and then took his own life from the Mandalay Bay Hotel and Casino in Las Vegas - the deadliest civilian mass shooting in modern US history.