On Monday, at least 50 people have been killed and another 406 were taken to the hospital after a mass shooting at a Las Vegas concert occurred.
The gunman, Stephen Paddock, is a 64-year-old local resident of Las Vegas and opened fire from the 32nd floor of the Mandalay Bay Hotel towards an open-air music festival attended by more than 22,000 people.
However, before he can be apprehended, he was found dead after officers stormed the rented room of the shooter where a number of guns were found.
US President Donald Trump tweeted his "warmest condolences and sympathies" to the victims and their families, and called the shooting "terrible".
Sheriff Joe Lombardo described the shooting as a "lone wolf" attack. He said there was no information about Paddock's motives.
"We have no idea what his belief system was," he said.
He also added that the police were now confident they had located a woman, later named as Marilou Danley, who was thought to have been travelling with the gunman before the attack.
Sheriff Lombardo said he was unable to give accurate details of dead and wounded, but have confirmed two off-duty police officers were among those killed.
The mass shooting has shook Las Vegas and the rest of the country, it being the worst mass shooting in recent US history.
As of now, the intel regarding the gunman is that: He was said to have had a large arsenal, a huge number of weapons in that hotel room, which police finally stormed using explosives.
According to witnesses and videos circulating in social media, the gunman had at least fired a hundred shots, which they believed to be from an automatic gun.
Many hotels on the Las Vegas strip close to the scene remained on police lockdown and parts of Las Vegas Boulevard were shut down.
According to a witness, Mike Thompson from London, he saw people running in total panic. "One man had blood all over him and that's when I knew something was seriously wrong. People were running and there was chaos."
The country music festival which was attacked by the gunman had been taking place since Friday at several hotels on the Las Vegas strip.
Singer Jason Aldean, who was rushed off stage when the shooting started, shared on Instagram that he was safe but heartbroken and did not know what to say.
"Tonight has been beyond horrific. It hurts my heart that this would happen to anyone who was just coming out to enjoy what should have been a fun night."
Nevada has some of the least severe gun laws in the United States and people are allowed to carry weapons and do not have to register themselves as a gun-owner.
Background checks are done when people buy guns, but they are also allowed to sell them privately.
Up till now, the state does not ban assault weapons, which include automatic or semi-automatic firearms.
