Michael Jackson's mother reported missing -- or is she?

Some family members of Michael Jackson have filed a missing persons report concerning the late pop star's mother, claiming they cannot find her and worry for her health.

The L.A. County Sheriff's Department got the report Saturday night at the Malibu-Lost Hills station and is investigating. Officials said they believe Katherine Jackson is with other family members but want to talk to her.

"She is reportedly with family members, but we are asking her to call us," said Steve Whitmore of the L.A. Sheriff's Department.

On Twitter, Paris Jackson, Michael Jackson's daughter, wrote: "Yes, my grandmother is missing. i haven't spoken with her in a week i want her home now."

An attorney for the Jackson children said they have not seen Katherine Jackson since July 15 and are concerned about her health.

"Knowing that their grandmother has never gone more than 24 hours without checking in with them when she travels, her grandchildren grew concerned after they failed to hear from her and contacted family members asking to speak with her. Michael's children were told by family members who were allegedly with Katherine Jackson that their grandmother was not available to speak to them," the lawyer said in a statement to CBS News.

Jermaine Jackson went on Twitter to say that his mother is fine. "I want to reassure everyone (inc all sudden medical experts) that Mother is fine but is resting up in AZ on the orders of a doctor, not us."

— Andrew Blankstein

Photo: Katherine Jackson / Associated Press