The Las Vegas Review-Journal and Las Vegas Sun report that the threat Saturday turned out to be a hoax and the man was arrested after the incident at Arizona Charlie's Hotel and Casino.
Police say the man apparently wanted to commit "suicide by cop." His name wasn't immediately released.
Police say the man walked up to the security desk inside the casino and showed a security guard what he said was an explosive device.
Guards persuaded him to go outside and evacuated the resort. The incident also prompted the temporary closure of the Boulder Highway outside the casino.