Multiple people were injured Tuesday morning after a chemical implosion at the Nippon Dynawave Packaging Facility in Longview, Washington, sending first responders to the plant just before 7:20 a.m. Residents were asked to avoid the area around the 3400 block of Industrial Way, along Highway 432, while crews worked the scene.

Longview fire officials said a vat of chemical treatment product imploded at the facility, leaving several people with chemical burns and other injuries. The injured were taken to PeaceHealth St. John Medical Center in Longview and PeaceHealth Southwest Medical Center in Vancouver, but officials had not released the number of people hurt or how serious those injuries were.

Fire crews and a Hazardous Materials Team remained on scene Tuesday, working with Nippon Dynawave employees to mitigate the product and the container involved. Officials said there was no threat to the city or the surrounding area, but the cause of the implosion had not yet been determined.

The response brings renewed attention to a site that already has a painful history. A massive fire broke out at the same location on July 18, 2023, and piles of wood burned for days after that blaze. This time, the emergency was different, but it again drew hazardous materials crews to the same industrial block and left unanswered questions about what went wrong inside the plant.

For now, the key question is not whether the danger spread beyond the facility, because officials say it did not. It is how a chemical container failed in the first place, and whether investigators can quickly determine why workers were injured at a plant that has already seen one major emergency in recent memory.