At least eight Disneyland employees were taken to a hospital on Tuesday after a hazardous materials incident in a backstage area, according to local news reports.

“This afternoon, building materials being used by a contractor produced a reaction backstage at Disneyland park, and the area was examined by appropriate response teams,” the company told E! News.

That reaction led to an odor that caused dizziness and shortness of breath in a number of workers. Some were treated at the scene and released, while eight were taken to a local hospital for evaluation.

Anaheim Police Sgt. Matt Sutter told The Los Angeles Times that the incident happened at about 12:30 p.m. in the area behind the Star Tours attraction.

The company told ABC 7 that no guests reported symptoms.