Susan Powell was reported missing Monday under what police are calling suspicious circumstances. A prayer service attended by about 100 people was held for her on Saturday in West Valley City.
Authorities searched a desert area where husband Josh Powell says he took the couple's two young children, ages 2 and 4, camping last weekend in freezing conditions.
Josh Powell returned Monday night, after police had already received a call from relatives who had not heard from the Powell family.
He declined to answer questions from reporters Saturday.