Federal agents conduct an extensive search near home of Nancy Guthrie, as delivery driver questioned

(ASSOCIATED PRESS) Fresh surveillance images from Nancy Guthrie’s porch the night she went missing, coupled with intense police activity across Arizona and the detention of a man had raised hopes that authorities were nearing a major break.

But then the man was released after questioning, leaving it unclear Wednesday where the investigation stood into last week’s disappearance of Guthrie, the 84-year-old mother of “Today” show host Savannah Guthrie.

FBI agents fanned out across a neighborhood about a mile from Guthrie’s home on Wednesday morning, knocking on doors and searching through the dense desert terrain filled with cactus, bushes and boulders. Several hundred detectives and agents are now assigned to the investigation, which is expanding in the Tucson area, the Pima County Sheriff's Department said.

In a nearby neighborhood, two investigators walked out of daughter Annie Guthrie’s home with a paper grocery sack and a white trash bag. One, still wearing blue protective gloves, also took a stack of mail from the roadside mailbox. They drove away without speaking to reporters.

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