Officers responded around 7:41 p.m. to a "domestic disturbance" at a home in the 6300 block of Monument Avenue in Portage, Indiana, police said.
As the officers approached the house, they heard gunshots inside, police officials said. Once inside, the officers found two deceased adults.
Another adult was found alive and was taken to a hospital with life-threatening injuries, Portage police said.
The victims all appeared to be related, police said.
No further information was immediately available. Police said there is no active threat to the community.
Portage police continue to investigate.