Yolo County officials have now released their determination for what killed the seven people in July's Esparto fireworks facility explosion. 

On Tuesday, the Yolo County coroner confirmed that all seven victims died from multiple blast and thermal injuries. Their deaths were immediate, the coroner says, and the manner was an accident.

The investigation into the explosion is still ongoing, with Yolo County officials also having declared a local health emergency on Monday. State and federal agencies are conducting an environmental review of the incident, now named by officials as the Oakdale Fire.

Yolo County public health officials noted that the declaration doesn't mean the site is unsafe, but that it may pose health risks.

"Today's local health emergency declaration for the Oakdale Fire allows Yolo County to request support from state and federal health agencies for testing and any necessary cleanup if hazardous materials from fireworks are found in the soil, water, or air at or near the explosion site," said Yolo County Public Health Officer Dr. Aimee Sisson in a statement.

Yolo County declared a separate local emergency days after the July 1 explosion to streamline the response to the incident.

Local officials have also urged the California Department of Justice to join the investigation into the explosion.

Residents within about a half-mile radius of the blast site are being urged to avoid ash and debris until the environmental review is complete.

The property where the explosion took place is near County Roads 23 and 86A, just south of the community of Esparto.