Report: Unclear what prompted Yellowstone mauling

HELENA — An investigation into the second of two fatal grizzly bear attacks last summer at Yellowstone National Park was unable to conclude if the same bear was responsible for both deaths, a report released Monday said.

But DNA tests show the bear that killed California hiker Brian Matayoshi in July fed on Michigan hiker John Wallace with one of her cubs in August, and evidence of two other bears in the area where Wallace's body was found much farther away — 65 feet and 492 feet from the body.

The report indicates there is no "clear evidence" to identify the bear that attacked and killed Wall...