The mother of a student at Townville Elementary School told CNN Greenville affiliate WYFF that her daughter and classmates huddled in a bathroom.
"Her teacher was shaken up. I know all the kids were scared. There was a bunch of kids crying," the unidentified woman said. "She didn't talk for about five minutes when I got her. ... I'm just so scared. I don't even want her to go to school now."
The mother said she was praying for the families of the injured.
Townville is in the extreme western part of the state, southwest of Greenville. Anderson County has a population of about 194,692. The elementary school has about 280 students. About 30 school employees are listed on the school's website. School picture day is scheduled for later this week.
This story is developing and will be updated as information becomes available.