Investigators have begun to look for clues about what happened in the final moments before the crash that killed 5-year-old Donasty Smith and 60-year-old bus driver Thomas Spencer, II.
Kendale Adams of the Indianapolis Metropolitan Police Department said there are many factors that will be examined.
"We'll look at speed, we'll look at weather, we'll look at functions of the bus, the actions of the driver, and the actions of the students."
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One part of the investigation has already been completed.
State Police inspectors started looking over the bus immediately after the crash to see if there was anything mechanically wrong that may have contributed to the crash.
An ISP spokesperson said those investigators found nothing wrong.
"In this particular case, we have concluded the inspection of the bus and we have found nothing related to the bus that would have been a contributing factor to the crash." said Captain Dave Bursten with the Indiana State Police.
Results of a preliminary autopsy on Thomas Spencer found no medical condition that could explain the accident.
The Marion County Coroner said Spencer died from the impact, however toxicology and further tests are still pending.
The lack of concrete answers leaves lingering questions about how this tragedy happened, questions that police are working deliberately to answer.
Adams adds, "Our investigators are very through and very good at what they do and so it's not in the department's or anyone's best interest to release any information that is incorrect."
It's unclear how long the investigation could last.
An investigation into Spencer's driving record noted found he was given three speeding tickets, the most recent in March 2010 for driving 58 mph in a 40 mph zone.
His license to drive the bus with a Commercial Driver's License was valid until 2015.