Detectives in Minnesota have questioned a doctor who saw the late singer Prince twice in the weeks before he died.

A police warrant has also revealed that Dr Michael Schulenberg prescribed medication to the singer on 20 April - the day before he died.

It does not say what was prescribed or whether Prince took the drugs.

The results of a post-mortem examination of the 57-year-old singer have discounted suicide. A medical examiner said full results could take several weeks.