Brazilian police say they are investigating the apparent disappearance of the mother-in-law of Formula 1 chief Bernie Ecclestone.

A police official speaking on the condition of anonymity tells The Associated Press that authorities are trying to find 67-year-old Aparecida Schunck. The official has knowledge of the investigation but is not allowed to speak publicly.

Several Brazilian news outlets have reported that Schunck was kidnapped in Sao Paulo on Friday. However, the police official said Wednesday that investigators are looking into other possibilities as well as kidnapping, though he would not specify.

Friends of Ecclestone's wife Fabiana Flosi, reached by the AP, declined comment. Formula 1 did not return messages seeking comment.

Schunck is Flosi's mother. Ecclestone met Flosi at a Brazilian Grand Prix and married her in 2012.