California officials are investigating the discovery of at least 117 dead dogs at Miranda’s Rescue Animal Sanctuary in Fortuna, northern California. Multiple outlets report that investigators found canine remains, including bones and skulls, at the property. Authorities say many of the dogs show signs consistent with gunshot wounds, including evidence of bullet fragments. The Guardian also reports that officials found more than 600 dog collars in an area they believe is linked to the deaths.

The sanctuary described itself as a “no-kill” facility. According to reporting cited by one outlet, Miranda’s Rescue says it accepts hundreds of dogs each year from shelters across the San Francisco Bay Area and receives significant funding in return. Investigators have not described a timeline for the deaths or publicly identified those responsible in the articles provided. Officials’ findings are prompting further inquiry into how animals were handled at the facility and the source of the dogs that came through the sanctuary.