Federal authorities in Idaho are following up on a possible sighting over the weekend of a Washington state man wanted in connection with the deaths of his three daughters.

The U.S. Marshals Service is searching the Sawtooth National Forest for Travis Decker, a Wenatchee, Washington, man whom officials have sought for more than a month after his daughters, ages 5, 8 and 9, did not return from a visitation trip with him in late May. The children were later found dead near a Washington campground.