Smokey Robinson

Los Angeles police have interviewed the private doctor who was with Michael Jackson when he apparently suffered cardiac arrest — and impounded the doctor's car because it may contain "medications or other evidence," police told TVGuide.com.

The news came as a coroner's investigator announced Friday that the cause of Jackson's death could not be determined without further testing, including toxicology results expected to take four to six weeks. Craig Harvey, chief investigator for the L.A. County Coroner's Office, said there was "no indication of any external trauma or any foul play."

See reactions to Jackson's death

The doctor's car, left at Jackson's home, was impounded because anything inside it "could be helpful to the coroner in determining the cause of death," Los Angeles Police Department officer Karen Rayner said. Detectives planned to talk again with the doctor, who was cooperative and is not under criminal investigation, she said. read more 24 Comments