Human remains were discovered Monday near Crystal Rapids on the Colorado River in Grand Canyon National Park, according to the National Park Service.
An independent search is underway for Nancy Guthrie's remains near the border following an anonymous tip about the whereabouts of her body, though authorities say there is no evidence to verify the claim.
Six U.S. states are tracking nine residents for possible hantavirus infections.
After more than 30 years of searching, an Arizona woman who went missing when she was 13 has been found alive.
A small plane struck two homes in Phoenix on Wednesday before crashing nose-down in a backyard, injuring the two people on board and a man in one of the homes, authorities said.
Investigators released new images and video of an armed individual suspect in the search for Nancy Guthrie.