FORT WORTH (CBSDFW.COM) – When firefighters in Fort Worth were called out to an apartment complex they arrived to find several units engulfed in flames.

It was just after 1:00 a.m. when Fort Worth Fire Department crews arrived at the complex in 1400 block of Vanderbilt Street West, near Eastchase Boulevard and Interstate 30.

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Flames spanned from the first-floor level of the building to out of the roof as firefighters worked from the ground to get the 2-alarm fire under control — structural damage caused by the blaze prevented them from entering the building.

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It took less than an hour for the nearly 50 firefighters to get the flames under control.

The apartment unit received major damage and several families are being relocated.

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No residents or firefighters were injured. Investigators are working to find out what sparked the fire.