Ammonia gas leak from a tanker truck in Oklahoma sickens dozens and forces evacuations

WEATHERFORD, Okla. (AP) — A leaking tanker truck spewed dangerous ammonia gas outside a hotel overnight, filling its hallways with fumes and forcing hundreds of nearby residents of a small Oklahoma city to evacuate, authorities said Thursday. Several dozen people were treated at hospitals.

Officials lifted a shelter-in-place order Thursday morning, hours after firefighters wearing gas masks went door to door in Weatherford, waking people up and telling them to leave because of the anhydrous ammonia leak.

An oil field worker staying at the hotel where the truck had been parked said he heard a “faint pop” Wednesday night and noticed a smell minutes later. He and a coworker left their room and hustled into a hallway and then an elevator filling up with a pungent odor.

Once outside, they saw their vehicles underneath a cloud of ammonia, said Michael Johnson, of Nacogdoches, Texas. "The smell itself punched me,” he said.

He took off running, but noticed his roommate wasn’t with him and saw that he had run for their trucks. He said a police officer managed to save his coworker.

“His lips were purple and frozen shut,” Johnson said. “His eyes were bloodshot red. His skin was all red.”

Johnson found one person stumbling and gave him a shirt to put over his mouth. At one point, he looked at the smoke and saw they were surrounded, thinking “We’re going to die.”

In all, 36 people were treated at the local hospital's emergency room, said Darin Farrell, president of Weatherford Regional Hospital. One person was admitted in good condition and 10 were taken to hospitals in Oklahoma City, he said.

Police Chief Angelo Orefice said early Thursday that four patients were in critical condition. SSM Health’s St. Anthony Hospital in Oklahoma City was treating seven patients, a hospital spokesperson said.

At least 500 to 600 people went to a shelter early Thursday while others were ordered to remain inside their homes for several hours. Some nursing homes were evacuated, and schools were closed for the day.

Anhydrous ammonia is used as a farm fertilizer to help corn and wheat grow. The colorless gas has a suffocating odor and can be deadly, especially at high concentrations, or cause breathing problems and burns to the skin and eyes.

Just last week, an anhydrous ammonia leak forced evacuations near Yazoo City, Mississippi, and two years ago, five people died in Illinois when a tanker truck spilled anhydrous ammonia after it was forced off a road by a passing minivan.

The cleanup in Weatherford — a city of 12,000 people about 70 miles (115 kilometers) west of Oklahoma City — could take several days, the police chief said.

“We pretty much got a lot of this stuff diluted right now,” Orefice said, adding that authorities were working with environmental officials.

The driver of the truck carrying the gas had parked behind a Holiday Inn Express to get a room there for the evening, Orefice said. The cause seemed to be a mechanical failure on a valve or a faulty seal, the police chief said.

Authorities said the air quality was being monitored and that the tanker truck was no longer leaking. A number of agencies were assisting, including hazmat crews and the Oklahoma National Guard.

Trisha Doucet called police for help when she learned the leak was blocks away from where her mother was caring for her bed-bound 89-year-old grandmother. An ambulance was quickly dispatched to get her to safety.