Authorities respond to a leak of an unknown chemical from a tank in La Habra

A slow leak from a chemical tank smeared an orange cloud across the sky of a Southern California neighborhood on Tuesday, but authorities said they quickly got it under control.

Los Angeles County Fire Capt. Aaron Katon said authorities responded to a business that makes cleaning products after receiving a call shortly before noon about the cloud. Police evacuated a nearby middle school as a precaution, Katon said.

They do not yet know what the chemical was, but all shelter-in-place orders have been lifted, he said. The regional air quality management district has deployed staff to the area to investigate, said Connie Villanueva, a spokesperson for the South Coast Air Quality Management District.

The company, Shepard Bros., could not immediately be reached for comment.

Three company employees reported minor respiratory irritation and declined further treatment, Katon said.

The leak occurred in the city of La Habra near a mix of residential neighborhoods and industrial warehouses about 10 miles (16 kilometers) north of Anaheim.

Keary Godinez, who works in a nearby restaurant, said she saw what appeared to be a dark yellow cloud spread across the sky. The 20-year-old said she watched students across the street board buses to evacuate, but police told her the eatery could remain open.

“It looked like pollen dust,” Godinez said, adding she didn’t detect a smell from the cloud. “It just kind of smeared in the sky and started going away.”

La Habra Mayor Jose Medrano had urged residents to shelter in place and said some streets were being evacuated.

Luis Gomez, who manages a nearby pickleball program, said earlier Tuesday he saw the cloud, called police and was told anyone within a mile radius of the location was under an evacuation order.