Authorities say they believe they spotted Travis Decker, an ex-soldier wanted in the deaths of his three daughters, in the remote backcountry of Washington state, after receiving a tip from hikers who said they saw a lone person who appeared to be ill-prepared for the conditions.

Officials said anyone residing in the area or staying in cabins should lock their doors and cars and check footage from cameras.

Washinton police have been searching for Travis Decker, 32, since he did not return his three daughters to their mother May 30.