Multiple fatalities have been confirmed following a chemical tank rupture at the Nippon Dynawave Packaging pulp and paper mill in Longview, Washington, on Tuesday morning. The hazardous materials incident occurred around 7:15 a.m. when a large tank containing "white liquor" ruptured, according to local authorities and the company.

Authorities initially described the event with varying terms, including a chemical explosion and an implosion, before settling on a rupture as the accurate description. White liquor is a caustic chemical mixture essential for the paper-making process, consisting of sodium hydroxide, sodium sulfide, and disodium carbonate.

Nine individuals at the facility sustained injuries, ranging from critical to minor, including chemical burns, and were transported to area hospitals. One firefighter also suffered an injury but has since been treated and released. PeaceHealth St. John Medical Center reported receiving nine patients, including one deceased, with others in fair condition or transferred to specialized facilities.

The incident is currently in a recovery phase, with officials stating it is stable. The exact number of fatalities and missing personnel remains undetermined as recovery efforts continue and next-of-kin notifications are pending. The cause of the rupture is still under investigation.

Longview Fire Battalion Chief Mike Gorsuch described the event as tragic, emphasizing that the immediate priority was life safety and incident stabilization. Cowlitz 2 Fire Rescue Chief Scott Goldstein noted that the 80,000-gallon tank was approximately 60% full at the time of the incident.

Patients with severe chemical burns and exposure were directed to burn centers, including facilities in Portland, Oregon, such as Legacy Health's Oregon Burn Center. Rick Graves, a spokesperson for Portland Fire and Rescue, confirmed their involvement in treating patients.

Authorities have assured the public that there is no immediate threat to the community. The focus for officials and the company remains on the ongoing recovery efforts and the thorough investigation into the cause of the tank rupture.

Further details regarding the number of fatalities and the circumstances leading to the rupture are expected to be released as the investigation progresses and notifications are completed.