LAS VEGAS (KLAS) — Dark smoke was visible in the skies over northeast Las Vegas Monday afternoon, according to reports from readers.

The Clark County Fire Alarm Office started receiving calls about an outside fire at 4470 East Cheyenne Avenue at approximately 3:15 p.m. on Monday.

The two-alarm fire was burning near Cheyenne Avenue and Lamb Boulevard. Over 30 minutes, the thick, black cloud diminished into a lighter grey as less smoke rose from the apparent fire.

According to fire crews, one employee at a building near the fire noticed a spark near one of the cardboard pallets. The employees tried to put out the fire but could not extinguish it before it began burning.

Crews also stated that the fire spread quickly due to the amount of material involved, along with increased wind speeds in the area.

10 engines, four ladder trucks, four rescue engines, four battalion chiefs, two air resources, and two investigators responded for a total of 72 personnel.

The cause of the fire is under investigation, and no dollar loss has been determined.

Fire crews expect to be on the scene for several hours.

There were no injuries to civilians, and there have not been any firefighter injuries, according to Clark County.

Crews were expected to remain on-scene for the next several hours as they continued to extinguish hot spots and overhaul the premises.

This is a developing story. Stay with for details as they become available.