The bombs, made with drain clog remover, went off Thursday on separate floors at Craigmont High School. Staci Franklin, a spokeswoman for Memphis schools, said it appears they were placed as a prank, CNN reported.
Franklin said the assistant principal's injuries were not believed to be serious
The federal Bureau of Alcohol, Tobacco, Firearms and Explosives was assisting in the investigation, fire officials said.
Mena Suvari shares her delightfully awkward Christmas card photo
Obama 'selfie' photographer speaks out: 'Photos can lie'