Three people were taken to local hospitals as a precaution this afternoon after workers power washing the outside of a hazardous materials building on the SMU campus triggered an alarm that automatically emitted a fire retardant, officials said.

About 200 people were evacuated from buildings in the area surrounding the 3000 block of Dyer Court after University Park and Dallas firefighters were called to the scene about 1:55 p.m.

No serious injuries have been reported, and fire officials have given the all clear to allow the evacuated people back inside, officials said.