What caused a freight train to derail near the Ohio-Pennsylvania border on Friday evening? That's what the NTSB (National Transportation Safety Board) will be trying to figure out.
NTSB investigators have arrived in East Palestine, Ohio, site of the derailment.
NTSB spokesperson Michael Graham said in a statement, "Our team methodically and systematically reviews all evidence and considers all potential factors to determine the probable cause and make any necessary safety recommendations."
At this time, first responders are staying back, as hazardous materials release from the wreckage.
The NTSB says the train was made up of 141 load cars, nine empties and three locomotives.
50 of them derailed, with 20 containing hazardous materials.
It started a massive fire with orange flames lighting up the sky.
First responders from more than 60 emergency agencies from three states responded to the scene.
Four tank cars in the derailment were carrying a chemical called vinyl chloride. The NTSB says at least one is slowly releasing it in the air, and that means it's doing its job.
East Palestine Mayor Trent Conaway says "We have to let the professionals take care of this we are by no means experts, they are," and the fire that's still burning...well, they just need to let the fire burn.
Officials said there were no injuries as a result of the derailment and fire, also they say that the air quality remains safe.
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