LAS VEGAS -- Just hours after a fire destroyed the top three floors of the Monte Carlo Hotel-Casino -- forcing the building's closure -- hotel workers started escorting people in to retrieve their belongings.

Around 5,000 guests were affected by the three-alarm blaze, which started around 11 a.m. Friday. Clark County firefighters were able to knock down the flames by 1:30 p.m., but the damage was done. The signature neon sign -- as well as the top three floors -- suffered major damage from the flames and forced the closure of the entire casino. While many guests say they did not hear any alarms at the time the fire started, firefighters said there were no casualties during the fast-moving blaze.

Thirteen people were treated for smoke inhalation at University Medical Center and, as of Saturday evening, only one remained in the hospital. Officials said the person is in fair condition.

MGM Mirage Inc., the Monte Carlo's parent company, took swift action to find other accommodations at sister properties after the fire. Monte Carlo guests were able to start retrieving their suitcases and vehicles starting at 8 p.m. Friday. Crews were taking the guests in groups to their rooms on the third through 26th floors. Those people staying on the 27th to 32nd floors will have to wait until county inspectors deem it safe.

Due to the significant damages to the top floors, county building inspectors said the roofline façade will have to be removed before the casino can be reopened to the public.

Clark County Building Chief Ron Lynn said inspectors found the 32-story building is structurally sound -- and reopening will depend on how quickly building owner MGM Mirage completes the roof work.

An MGM Mirage spokesman said work on the facade will start as soon as possible.

Employees of the Monte Carlo are also being taken care of by the company. They will receive pay and benefits for up to 30 days, or until the casino reopens. Company officials have established a hotline to help their workers determine if and when they can go back to work, as well as potentially shifting them to other sister casinos.

Fire investigators are still trying to determine the cause of the blaze and the amount of damages.