Officials with Dallas Fire-Rescue are investigating whether a building fire that occurred early Tuesday morning in an East Dallas high-rise may have been set intentionally.

Firefighters responded to a call just before 5 a.m. on April 25 at the Uptown Tower, located at 4144 North Central Expressway in Dallas, and saw smoke on the first floor of the 12-story building.

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The blaze took 20 minutes to extinguish, as most of the flames had been taken care of by the building’s sprinkler system.

Jason Evans, the spokesman for the Dallas Fire-Rescue, said investigators suspect someone tossed an incendiary device through a window and set fire to the first-floor leasing office.

Authorities stated that no one was inside the office at the time, and no one was injured in the building. One firefighter sustained a musculoskeletal injury while cleaning up after extinguishing the flames and was transported to a nearby hospital.

Officials say they are still searching for a suspect and a motive for the fire and ask anyone with information to come forward to assist in the investigation.