A train derailment forced dozens of families to evacuate their homes early Saturday morning in Wynnewood.
Officials said two of the derailed cars were leaking sodium hydrosulfide which, if inhaled, can be harmful.
Jennifer Unruh and her family were sleeping when she heard a crash.
"You could hear the train was going fast and, all of a sudden, you heard this big boom and then nothing," Unruh said.
Officials knocked on nearby homes and apartments informing everyone they needed to leave the area immediately.
Garvin County Emergency Management worked to resolve the situation placing around 50 people in the First Baptist Church in east Wynnewood.
"In the middle of the night, at 2 o'clock in the morning when everything is dark and you can't see what's leaking and what's not and what the damage is, it's just very important to take that extra step to make sure that everybody's okay," Garvin County Emergency Management Director Dave Johnson said.
Unruh said she got her children up and rushed them to safety.
"We evacuated a third of a mile on each side of the train for about a mile," Unruh said.
The roadways are clear now and residents were able to return to their homes. The cause of the accident remains under investigation.