Alia Sierra (Photo: Provided) 
 
 FRANKFORT, Ind.  Authorities say a teenager was traveling at more than 100 mph while high on opiates when she crashed her car into a house in Frankfort, Indiana, last month — killing an 8-year-old girl and her 17-year-old sister inside, PEOPLE confirms. Alia Sierra, of Frankfort, faces 10 felony charges, including two counts of reckless homicide in connection to the deaths of 17-year-old Haleigh and 9-year-old Callie Fullerton, who were killed July 13 when a car careened through their living room and nearly came out the other side of the structure. More Crime News: Greater Lafayette's deadly potential for domestic violence 
 
 A urine screen showed that Sierra tested positive for opiates, and detectives determined she was driving 107 mph at the time of the crash, according to findings of the investigation, which were cited in a probable cause affidavit. Four teens between the ages of 12 and 17 were also in the car with Sierra at the time of the crash. Three passengers interviewed by detectives said they were picked up by Sierra that evening but asked to get out of the car when she began to drive unsafely, according to their statements to police, which were cited in the affidavit. One passenger said Sierra hit a bump, swerved and lost control of the 2007 Honda Accord; another passenger recalled Sierra saying her car was "the beast"; a third passenger observed the speedometer exceeding 100 mph, according to court documents. Sierra is facing the following felony charges: 
 
 Two counts reckless homicide 
 
 Two counts causing death when operating a motor vehicle under the influence of a controlled substance 
 
 Two counts causing death when operating a motor vehicle while intoxicated 
 
 One count causing serious bodily injury when operating a vehicle while intoxicated 
 
 One count causing serious bodily injury while under the influence of a controlled substance 
 
 One count criminal recklessness 
 
 One count criminal mischief 
 
 Sierra's next court date is scheduled for October.
– The opioid epidemic may have claimed two wholly innocent victims. Police say the 17-year-old who killed two sisters after the car she was driving crashed into the girls' Frankfort, Ind., home in July was high on opiates. RTV6 describes a harrowing lead-up to the crash, citing detectives who say Alia Sierra was driving her 2007 Honda Accord at a speed of 107mph when she left the road and careened through a field and ditch before slamming into the home. She had four teen and pre-teen passengers in the car with her; one told police he asked Sierra to let him out of what she called "the beast" because the speeds were scaring him. Sierra faces 10 felony charges, including two counts of reckless homicide in connection with the deaths of Haleigh Fullerton, 17, and sister Callie, 8. People reports the girls had been watching TV on the couch; the Journal & Courier says the car entered their home with such force it nearly exited the other side of the living room. Sierra has been charged as an adult and entered a preliminary plea of not guilty on Friday. Her lawyer plans to appeal the adult classification in a bid to get her case pushed back to juvenile court. (This teen who livestreamed a fatal crash says "everybody does it.")