The family of pop star Michael Jackson who died unexpectedly on Thursday may seek a second autopsy.
Veteran U.S. politician and activist Reverend Jesse Jackson - who is not related to the singer - told ABC television that he had spent Friday counseling the family. He said Jackson's family is angry and frustrated that the cause of his death has not yet been determined.
The Los Angeles County coroner's office says it may be weeks before it knows what killed the singer.
Police were intending to interview Jackson's personal physician, Dr. Conrad Murray. Authorities were searching the doctor's vehicle as part of their investigation.
An official of the coroner's office (Craig Harvey) told reporters late Friday that an autopsy of Jackson's body indicated no signs of external trauma or foul play. But, he said the office is deferring a determination on the cause of death.
The spokesman said additional toxicology and pulmonary testing is needed before a determination can be made, which could take four to six weeks.
Jackson's body was released to his family late Friday and is kept in an undisclosed location.
He was pronounced dead Thursday at the UCLA Medical Center after suffering cardiac arrest at his Los Angeles home.
The pop star died about two months before his 51st birthday, and just before July's scheduled launch of a series of comeback concerts in London. Tickets for his London shows, offered in March, sold out in minutes.
Jackson had been rumored to be in ill health for years, but the promoters of his London shows say he passed a recent medical examination.