Dallas Fire-Rescue is investigating the cause of a fire that broke out early Sunday morning that damaged a building containing several businesses.

Luckily, none of the businesses in the 10600 block of Wireway Drive were open at the time of the fire, but one of the business owners called to report the fire after going to check on his shop around 9 a.m.

The billowing smoke could be seen from a long distance away, and Dallas residents took to Twitter to discover the source of the blaze:

After the call was placed, officers responded to the scene, where thick black smoke enveloped at least two businesses in the one-story building. Due to the size of the fire and the speed at which it spread; firefighters could not enter the building.

The fire grew so large before they got there that Dallas Fire-Rescue had to put it out from outside of the building. It took hand lines and four aerial ladder pipes to surround the fire and drown it out.

There was significant damage to the building, including a collapsed roof, by the time firefighters were able to extinguish the flames roughly three hours after arriving. No injuries were reported to business owners, patrons, or fire and rescue personnel.

Since the building was deemed unsafe for crews and investigators to enter, the cause of the fire is still being looked into as investigators go through the remains.