LOS ANGELES - Michael Jackson's brother says it's believed that the pop star died of cardiac arrest.

Jermaine Jackson cautioned at a hospital press conference Thursday that the cause of his death would not be known until an autopsy was performed.

He said Michael Jackson's personal doctor and paramedics tried to resuscitate him at his rented home in Holmby Hills. A team of doctors at UCLA Medical Center also tried for more than an hour.

Los Angeles police Lt. Gregg Strenk said at a separate news conference that police robbery-homicide detectives have been ordered to investigate, which is common in a high-profile case. Strenk says the coroner's office, which will handle inquiries into the type of death, is taking possession of the body.

THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.

LOS ANGELES (AP) Michael Jackson's brother Germaine says it's believed that the pop star died of cardiac arrest.

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