WAGNER -- Two people were killed and two others were injured Wednesday afternoon when an explosion occurred in a house on tribal land north of Wagner.

According to Yankton Sioux Tribal Police Chief Willard Bruguier Jr., two people were pronounced dead at the scene, and the two who were injured were airlifted to Sioux Falls. The identities of those involved have not been released as investigation into the explosion is ongoing.

A 911 call was placed at 2:22 p.m., and the house, located at 823 Spruce Street in the tribe's North Housing about 1.5 miles north of Wagner, was declared a total loss after the explosion and the fire that followed. No other structures were affected.

The cause of the explosion is still under investigation, but Wagner police told The Daily Republic it is believed to have been propane-related.

The Dante, Ravinia and Wagner fire departments responded to the scene, as did ambulance services from Wagner, Lake Andes and Armour.

Tribal law enforcement, the Bureau of Alcohol, Tobacco, Firearms and Explosives, the South Dakota State Fire Marshal and the Yankton Sioux Housing Authority are investigating the incident.