A hazardous materials team responded to the baggage area at Terminal 8 around 7 a.m. to investigate the issue, according to the Los Angeles Fire Department. Authorities said three people were in “mild danger” and a fourth person in serious condition. According to the LAFD, the source of the leak is believed to be a utility room in the area. The four people were all independent contractors, three men and one woman, who were in or near the room at the time. Authorities added that a popping sound was heard shortly before the leak. One of the workers, a man in his 50s, was found without a pulse in the room. Paramedics performed CPR and he was taken to hospital in critical condition. “It’s important to note that none of the travelers were medically affected by this,” said LAFD Capt. Erik Scott. “They were not in an area adjacent to that electrical room, there was no way through where they could have come in contact with the carbon dioxide.” Out of an abundance of caution, officials said about 100 people were removed from Terminal 8 during the search and sent to Terminal 7 for screening. Arriving United Airlines flights were temporarily grounded, but the ground stop was lifted a short time later. Want to read this article in Spanish? Click here Copyright © 2022 KABC Television, LLC. All rights reserved.