LAS VEGAS -- A spectacular fire is raging atop the landmark Monte Carlo Resort and Casino on the Las Vegas strip, consuming large portions of the complex's top floors and sending plumes of thick black smoke into the air.

Fire crews on top of the 3,000-room hotel at 3770 Las Vegas Blvd. are trying to contain the blaze, which broke out shortly after 11 a.m.

Four workers are trapped on the roof. There is no word yet on what happened to them.

Four hotels have been evacuated -- Bellagio; New York, New York; MGM and City Center.

The blaze began at the top of the hotel and has spread down into four different parts, including the roof, top corner and a couple of floors down. There are 32 floors and about 3,000 people staying at the hotel.

Guests were spotted looking out of hotel windows, and guests were gambling up until a recent evacuation.

Guests who are attempting to check in are being turned away.

Debris is falling from the blaze, and it is catching other parts of the hotel on fire.

Las Vegas Boulevard is closed from Harmon to Tropicana avenues.

There is no word on the cause of the blaze or whether or not there have been any injuries.

Dave.