The legendary resort was on lockdown for about half an hour following reports of an active shooter, ABC News reported.
Early reports on social media of shots being fired at the busy casino and hotel were false and there were no injuries, the Las Vegas Police Department said on Twitter.
The police officials are still investigating the incident which appears to be a burglary either at the Rolex store or in the casino itself.
Authorities said the suspects broke into a high-end jewelry and watch store, where they may have used sledgehammers to break into the shop's jewelry cases. A photograph of a man wearing a pig mask also resurfaced and he is believed to be the shooter.
Match Play begins with unlimited possibilities
You can talk about match play but at the end of the day you need to shoot good scores and that's what I did today". Day started this year with only one top 10, a tie for fifth at Pebble Beach, in five tournaments.
Police said three suspects fled the robbery into the nearby parking garage and tried to escape in a vehicle.
Several people have been detained but it's not clear if they are the burglary suspects, according to CNN. When it wouldn't start, they tried to carjack someone else, and then tried to run away, the Sun reported.