Katherine Jackson has spoken to police, and she is not in danger ... TMZ has learned.

Law enforcement sources tell TMZ police were able to make contact with Katherine today ... and she informed them "she is fine and with a family member."

Another source tells us she is Arizona.

The LA County Sheriff's Department has been investigating Katherine's whereabouts since she was reported missing late Saturday night.

We're told the Sheriff's Dept. is still speaking to Jackson family members to find out exactly why Katherine's nephew filed the missing person report in the first place.

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