Four people exposed to leaking gases at a Wilmington refinery today were transported for hospital treatment, one in serious condition, authorities said.

The problem was reported at about 6:40 a.m. in the 2100 block of East Pacific Coast Highway, according to the Los Angeles Fire Department.

The gases were reported to be butane and hydrogen sulfide, according to Nicholas Prange of the LAFD. Crews shut down the leak, and there was no evacuation order involving the nearby community, Prange said.

“The hazardous materials risk has been mitigated,” Prange said.

Paramedics transported four patients: a 40-year-old man in serious condition; and three other men—ages 26, 35, and 43—in “moderate” condition, Prange said.

The man in serious condition was rescued from an elevated surface using a rigid basket and rope system, according to authorities.

The circumstances of the leak were under investigation.

Editor’s note: This story has been updated to provide more information on one of the men who was hospitalized.

Staff reporter Fernando Haro Garcia contributed to this story.