• Five workers hospitalized after showing symptoms

• Nearby areas evacuated as a precaution; no visitor injuries reported

Several employees at a California amusement park were injured following a chemical reaction in a backstage area reserved for staff.

The Anaheim Fire Department said emergency crews responded to reports of an unusual odor near one of the rides.

Initial reports indicate the reaction occurred when materials used by a contractor on site unexpectedly reacted chemically.

First responders, wearing hazardous material suits, managed the situation while aerial footage showed emergency units spread across the area.

Paramedics treated some workers on-site before allowing them to leave, while five others were taken to nearby hospitals after experiencing dizziness and difficulty breathing; their conditions were not immediately clear.

As a precaution, certain nearby areas were temporarily evacuated, with reopening expected later.

The park administration did not disclose the type of materials involved or how many employees were present during the incident.

Authorities confirmed the incident was contained to the backstage staff area, with no injuries reported among visitors, and the park continued operating while emergency teams handled the situation.