The attack, discovered Tuesday, came as people gathered for the world's largest tech show.
Whoever came up with the slogan, "What happens in Vegas stays in Vegas," wasn't prepared for a cyberattack. But that's what happened in the early morning hours on Tuesday, when the team monitoring computers for the City of Las Vegas detected it had been "compromised".
The city, which tweeted about the attack, didn't say which systems were affected or how the attack happened, though the Las Vegas Review-Journal reported it may have been an email attack. But its timing couldn't have been worse.