LOS ANGELES — Authorities said Sunday they believe Katherine Jackson, the mother of Michael Jackson and the guardian of the pop legend’s three minor children, is safe in Arizona with family members after she was reported missing.

The disclosure came after another concerned family member officially reported her missing Saturday night amid a dispute over the estate of her superstar son.

A person familiar with Katherine Jackson’s whereabouts said she is with her daughter, Rebbie in Arizona and following a doctor’s orders to rest. The person was not authorized to speak publicly and spoke on condition of anonymity.

Sheriff’s officials later said they believe the 82-year-old is in Arizona with a relative, but that they were still trying to establish contact with her.

Katherine Jackson’s whereabouts caused concern for some family members in recent days, and her granddaughter Paris Jackson issued a frantic plea on Twitter early Sunday.

“I haven’t spoken with her in a week I want her home now,” she posted from her Twitter account. She also tweeted a number for people to contact in case they saw her grandmother.