Las Vegas police have said they are responding to a "major accident" near the casino where the Miss Universe pageant was held.
Reports suggested a car ran into a crowd of pedestrians outside the Planet Hollywood Resort and Casino.
The number of those injured was unclear, but the Las Vegas Review-Journal newspaper said it could be as many as 27 people.
A magnitude 5.4 earthquake has struck the US state of Nevada, near the town of Helene 90 miles northeast of Las Vegas, the US Geological Survey has said.
Reuters report that the quake was quite shallow at a depth of only 12 miles.
There has been no reports of damage or casualties, authorities have said.
The Clarion casino-hotel, once owned by Hollywood star Debbie Reynolds, had stood in the Las Vegas strip for more than 40 years.Read the full story ›
Oscar-winning actor Ben Affleck was banned from playing blackjack at a Las Vegas casino because he was "too good," a source close to the 41-year-old Good Will Hunting star said.
Affleck was on a short break in the city with his wife Jennifer Garner when he was stopped earlier this week by security guards at the Hard Rock Casino.
They told him he had to stop playing blackjack because "you are too good," the source said.
He was told he could play other games at the casino.
Celebrity news website TMZ reported Affleck had been banned for life from the casino for counting cards, a legal gambling strategy of using probability to predict the next hand.
A gambler who lost $500,000 (£298,000) in 17 hours at a Las Vegas casino has claimed he should not pay his debt because he was too drunk.Read the full story ›
LG Electronics has unveiled a fitness wristband to monitor the user's heartbeat, calorie consumption and movement, as well as incoming phone calls and music controls.
The Lifeband Touch measures performance via fitness apps and a touch screen.
It can also be combined with earphones that measure blood flow signals from the inner part of the ear to monitor heart rate and oxygen consumption.
Film director Michael Bay walked out of a major product launch on the first day of the Consumer Electronics Show in Las Vegas after appearing to be lost for words.
The director of the Transformers films and Pearl Harbour was speaking at the launch of Samsung's new curved TV when he stopped abruptly, saying: "The type is all off, sorry. I'll just wing this".
A Samsung executive then prompted him to ad lib with some questions, but the director apologised and walked off stage.
Michael Bay later explained on his website that he "got so excited to talk" that he skipped a line, causing the autocue to "get lost".
"I guess live shows aren't my thing," he added.
The Consumer Electronics Show opens in Las Vegas later today showcasing new technologies in areas as diverse as cars and gaming, smart phones and wearable technology.
The conference website says it is expecting more than 150,000 people to attend from more than 150 countries.
The four-day show is not open to the public and often provides a first glimpse of new products and emerging trends in technology.
A performer with the circus group Cirque du Soleil has died during a performance at the MGM Grand venue in Las Vegas, NBC reports.
Sarah Guyard-Guillot, 31, was pronounced dead shortly before midnight on Saturday, but the cause of death has yet to be determined.
An audience member told the Las Vegas Sun that the performer fell almost 50 feet from a wire into a pit below the stage, and that he could hear "screaming" and "groaning".
Cirque du Soleil said in a statement that the group was "heartbroken" and that the tragedy was a reminder of "how extraordinary our artists are each and every night".
Sergeant John Sheahan has confirmed that a Black Range Rover sport and a Maserati had stopped at a red light on the Las Vegas strip when the Range Rover opened fire on the Maserati.
Both cars went through the intersection. The Maserati hit a taxi. The driver and passenger of the taxi were killed after the taxi caught fire.
The driver of the Maserati died from gunshot wounds and the passenger was wounded. The Range Rover then fled the scene. Three other vehicles were involved.