(CNN) At least three well-dressed masked burglars, carrying sledgehammers, smashed their way into a high-end jewelry store early Saturday at one of Las Vegas' most luxurious hotels.

The burglary prompted authorities to lock down parts of the swanky Bellagio Resort & Casino and sent panicked guests rushing outside.

Las Vegas Metropolitan Police Lt. Carlos Hank said the men were wearing suits and at least one had on a pig mask. Hank added authorities believe one of the men was carrying a gun.

The suspects had their faces concealed by masks and fled from the casino, the Las Vegas Metropolitan Police Department said.

One suspect was in custody and being interviewed by investigators Saturday.

Twitter user Kira Kamil described seeing the burglary.

"Literally just witnessed an armed robber in a pig mask at a Rolex store at the Bellagio & then his arrest," Kamil wrote.

No one was injured during the robbery.

Authorities said it's too soon to put a price tag on the theft.