Two trains collided at a textile mill in Aiken County, South Carolina yesterday. The collision caused a chlorine leak that killed eight people, including five mill employees, the train engineer, a truck driver and a man in his home near the scene.
One mill worker is still missing.
Hundreds of people who live in the area had to be decontaminated and then sent to the hospital because of the fumes. Officials say it's still too dangerous for any of them to return home.
A shelter has been set up at the University of South Carolina in Aiken.
The National Transportation Safety Board is investigating the cause of that accident.