Students at Sandtown Middle School in South Fulton County, Georgia, reported feeling ill after eating candy and snacks.
"People were like screaming down the hallway and stuff," one student told Eyewitness News.
The students said they felt nauseated and disoriented. Twenty-eight students were rushed to the hospital.
School officers are checking to see if the treats were intentionally tainted, and are sending samples to a lab. They're also considering the possibility of drug use.
Officials initially moved to evacuate the school, but later walked back that decision.