AUSTIN (KXAN) -- A woman is facing charges of failure to stop and render aid and aggravated assault after she allegedly struck four pedestrians and then a food truck, causing it to catch fire, in southeast Austin Tuesday, according to the Austin Police Department. APD, the Austin Fire Department, and Austin-Travis County EMS provided details during a joint media briefing Tuesday night. ATCEMS Captain Christa Stedman said medics responded to reports of the crash around 5:13 p.m. One person was declared a "trauma activation" and was transported to a local trauma facility with "serious not expected to be life-threatening injuries." Additionally, one other adult was transported to a local trauma facility with minor, non-life-threatening injuries. Two other adults were treated on the scene but refused EMS transport, Stedman said. The incident was reported near Elmont Drive and South Pleasant Valley Road. Rachel Lewis with AFD said the call initially came into the department as a traffic accident with reports of a vehicle hitting a food truck and pedestrians in the area. Lewis said AFD upgraded the call to send additional resources to the scene, and when personnel with the department arrived they found the food truck on fire and "multiple patients on the ground." AFD extinguished the fire and worked with ATCEMS to treat the patients, according to Lewis. APD public information officer Austin Zarling said the call first came into APD around 4:30 p.m. for a woman who reported her phone was stolen. Officers were unable to find the phone or the person who stole it. About ten minutes after officers left that call, another call came in at the same location for a crash hotshot, Zarling said. When officers arrived, they found multiple people who "appeared to have been run over by a vehicle." The food truck in the area was also on fire at that point. Police believe the driver of the vehicle involved in the crash was the same woman who reported that her phone was stolen and that it "appears she was upset with the person who she believed to have taken that phone, and tried to use her vehicle to run over that person, and consequently struck that person as well as other persons, and the food truck, which then caught on fire," Zarling said. According to police, one of the victims was the father of the woman's child, and the incident is being investigated as an aggravated assault family violence, as well as failure to stop and render aid. ATCEMS and the Austin Fire Department responded to a crash involving multiple pedestrians and a food truck that caught on fire in southeast Austin. (Sarah Al-Shaikh/KXAN News)ATCEMS and the Austin Fire Department responded to a crash involving multiple pedestrians and a food truck that caught on fire in southeast Austin. (Sarah Al-Shaikh/KXAN News)ATCEMS and the Austin Fire Department responded to a crash involving multiple pedestrians and a food truck that caught on fire in southeast Austin. (Sarah Al-Shaikh/KXAN News)ATCEMS and the Austin Fire Department responded to a crash involving multiple pedestrians and a food truck that caught on fire in southeast Austin. (Sarah Al-Shaikh/KXAN News) Zarling said the woman is not in custody, but detectives have identifying information on the woman and will conduct an investigation and if they found probable cause, they will draw up a warrant for her arrest. According to Lewis, the cause of the fire was still undetermined and remained under investigation Tuesday. No other details were released by officials Tuesday.