Detectives are questioning a 13-year-old boy after they say he brought two balloons filled with cocaine to a Terra Bella campus.

Carl F. Smith Middle School in Terra Bella was flooded with panicked parents on Friday after reports that cocaine had made its way to the playground.

At least 13 students were exposed and two students were hospitalized, deputies said.

Some parents were unaware until a news story was posted on social media. Others learned when they got to school.

Maricela Madrano arrived at the school to pick up her daughter for a routine dentist appointment.

She was shocked to learn about the incident.

“I’m very concerned for my daughter’s safety at school after today,” Madrano said.

Madrano said she has previously heard reports of students smoking marijuana on campus, but hadn't been able to confirm with the school district.

“The school should give more attention to the kids," Madrano said. "This is scary.”

Tulare County sheriff's detectives and medical personnel were called around 8:30 a.m. to Carl F. Smith Middle School after students reported finding two balloons filled with a "mysterious white substance."

Initially, the school staff thought it was flour and were going to "wash it away." They called 911 as a precaution and dispatchers told them to leave the substance where it was, said Tulare County Sheriff Lieutenant Kevin Kemmerling, who heads the Porterville Substation.

Narcotics detectives were then called.

"They verified that it was cocaine," said Nick Garcia, director of business services for Terra Bella Union Elementary School District.

Paramedics were called and began treating numerous students.

"The reason (the students) contacted school staff is they were messing with the balloons and they pulled open the balloons and saw white powdery substance and two students became very dizzy," said Tulare County Sheriff Mike Boudreaux.

Preliminary field tests showed the students were not under the influence of the drug, Boudreaux said.

Two students became dizzy and were taken to Sierra View Medical Center in Porterville as a precaution, he said.

Boudreaux said paramedics and detectives remained on scene while they gathered clues and ensured students were safe.

Classes resumed after the campus was cleared for drugs, Boudreaux said.

Through the department's investigation, it was discovered that a 13-year-old boy brought the cocaine onto campus.

Police dogs were used and detected cocaine on the student's shirt.

"He is currently being interviewed by detectives," Boudreaux said at a press conference Friday afternoon.

A search of the student's home was also being conducted at the time of the press conference, Boudreaux added.

"I've sent the world," Boudreaux said. "Our community and children are a priority."

More:Woodlake police officer arrested on suspicion of rape, kidnapping

More:50,000 marijuana plants destroyed, 4 Tulare County men arrested

More:Narcotics officers take 3 pounds of cocaine, meth off Visalia streets