Michael Jackson's family has had a private pathologist perform a second autopsy on the pop star's body, sources in Los Angeles said.

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The second autopsy was conducted hours after Jackson's body was released to relatives by the county coroner Friday night, The Los Angeles Times reported Sunday.

Meanwhile, after interviewing Jackson's personal doctor for three hours Saturday night, Los Angeles police found "no red flag" to suggest criminal wrongdoing or the possible cause of Jackson's Thursday death, a source close to the investigation told the Times.

Dr. Conrad Murray was with Jackson, 50, when the singer went into cardiac arrest at his rented Holmby Hills home in Los Angeles.

Coroner's officials said Jackson had been using prescription drugs and listed his cause of death as "deferred" until more tests are complete, which could take up to six weeks.

The second autopsy could give Jackson's family information more quickly by rushing toxicology tests through a lab within days, said Michael Baden, a former chief medical examiner in New York City.

At the time of his death, Jackson was preparing for a series of comeback concerts in London, the first set for July 13.