The man inside the vehicle was said to be writing messages and showing them through the windows of the vehicle, according to witnesses on social media. It is not clear what was written on the notes, though a local CBS News affiliate reported that one of the notes said to release unredacted inspector general reports on the FBI's conduct in the 2016 elections.
"You can't get away from politics," remarked Columbia Journalism School director of alumni relations Maria Newman.
Police arrived on the scene about 15 minutes following the blockade of the bridge. About 45 minutes after police responded, the man was "taken into custody without incident," the Nevada Highway Patrol's Southern Command said on Twitter. The man was arrested by Arizona police.
US Highway 93 was closed in both directions. The road was re-opened after the person was detained.
The man was wearing a mask and carrying a machine gun while barricaded inside the vehicle, Metro Police Officer Jay Rivera tells the Las Vegas Sun.