(CNN) Sonia Mongol says her son was not allowed to go to the restroom at his South Los Angeles school and instead had to wear two plastic garbage bags and sit in his urine-soaked clothing, according to CNN affiliate KCAL.

Mongol talked about the alleged incident in November during a news conference at Manhattan Place Elementary School Thursday. She said her 8-year-old son was not allowed to use the restroom during class. Mongol called on school officials to clarify what happened.

The district told CNN in a statement Thursday that it is conducting an investigation.

"Los Angeles Unified takes all matters concerning the safety and well-being of our students very seriously," a Los Angeles Unified School District spokesperson said. "Upon learning about this allegation, law enforcement was notified immediately, and we are fully cooperating in the investigation. Los Angeles Unified is also conducting an administrative investigation. Due to confidentiality laws, we cannot offer further details at this time."

What she says happened

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