Three Irving firefighters were hurt battling what was originally described as a three-alarm fire at a Las Colinas high-rise office tower Sunday morning. But the white "smoke" seen billowing from the top of the 26-story central tower in the Williams Square complex at 5215 North O'Connor Boulevard turns out to have been water vapor from a malfunctioning sprinkler system. Two of the firefighters were hospitalized after a hose popped off a standpipe and struck them. A third firefighter was also taken away in an ambulance for treatment. Their injuries were said to be not serious. Irving Fire Department Assistant Chief R.W. Wilson confirmed that the 7:30 a.m. incident was not a fire. He said a "deluge system" designed to extinguish fires had been triggered by a malfunctioning sensor. The water then cascaded down on the fan blades of the building's air conditioning system, which spun the water into a cloud-like vapor seen rising from the top of the tower.
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