The giant consumer electronics show CES has suffered a power cut, plunging part of the event into darkness.
The Las Vegas Convention Center (LVCC)'s central hall went dark at around 11:20 local time (19:20 GMT) .
The organisers tweeted they were experiencing an "isolated power outage", adding they were working to resolve it.
Attendees were evacuated from the affected space, which hosts booths for LG, Samsung and Sony among others.
The power failure followed heavy rain the day before, which had already forced Google to shut its booth based in the LVCC's car park.
It had been the city's first rainfall in more than 100 days, although it is not yet clear whether this is related to the power failure.
The trade fair is marketed as the "world's gathering place for all those who thrive on the business of consumer technologies".
Some booths and venues still had power, the Consumer Technology Association (CTA) said.
It also encouraged attendees to "get outside on this beautiful Las Vegas day".
By: Dave Lee, Las Vegas
At an electronics show, electricity is key.
As I write this, the cause of the blackout is not known. But Vegas was pelted with rain this week, and this city just cannot handle it.
Roads have flooded, hotels are leaking – including into this reporter's room – and now, potentially, this.
Embarrassing for a city that prides itself on being the best equipped for enormous shows like CES.
Patience is being tested here. This show isn't just about playing with gadgets, it's about big business. Cancelled meetings might mean deals aren't done.
I saw one delegate get irate when he was told he could not go into the main hall for his meeting.
"You ain't meeting in the dark, buddy!" the show floor worker told him.
With every passing minute, this power cut is costing a lot of people a lot of money.