UPDATE (4:28 p.m. June 27):
South Houghton Road has reopened, according to the Pima County Sheriff's Department.
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South Houghton Road is closed in both directions between East Sahuarita Road and East Camino del Emperador due to a car fire, according to a Facebook post from the Pima County Sheriff's Department.
The post advises drivers to avoid the area and to find alternate routes.
