Pop superstar Michael Jackson performs a song dressed like a U.S. 'Cop' during a concert in Sao Paulo, in this October 15, 1993 file photo. [Agencies]

LOS ANGELES - Coroners have completed the autopsy report on the body of pop star Michael Jackson, but details remained under wraps on Monday as police probe the cause of the singer's death and his prescription drug use.

A Los Angeles Police Department spokesman said detectives requested the autopsy, which includes toxicology tests, remain sealed until their investigation was finished. He could not say when it would be completed and declined to offer more details.

Some media outlets reported that the "Thriller" singer's body has now been buried at the Forest Lawn cemetery in Los Angeles, but that could not immediately be confirmed through a family spokesman. A cemetery spokesman declined to comment.

Police are looking into why the 50-year-old singer died suddenly of cardiac arrest on June 25. Numerous media reports have said officials are focused on Jackson's use of a powerful anesthetic called propofol to sleep. Police and federal agents have raided several offices of Jackson's doctors as part of their probe.

Meanwhile, the judge overseeing the singer's will said he had approved several business deals, including a $60 million agreement with Columbia Pictures to make a movie from video of the King of Pop's rehearsals for a series of concerts that had been set to take place in London this past July.

Those shows were dubbed "This Is It" by Jackson, and the movie will be similarly titled. Columbia Pictures, a unit of Sony Corp's Sony Pictures Entertainment, said the film, due to be in theaters on October 30, will have performances and behind-the-scenes video of Jackson preparing for the concerts. Some of it will be shown in movie theaters in 3-D.

The judge also agreed to the re-issuance of the singer's autobiography, "Moonwalk," currently planned for October.

Lawyers spent much of Monday in court wrangling over merchandising deals still being planned and a traveling exhibition of Jackson memorabilia that concert promoter AEG Live, which had backed the London concerts, wants to mount.

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Attorneys for Jackson's mother, Katherine, said they had concerns about the involvement of AEG in deals struck with the executors of the pop star's estate.

Judge Mitchell Beckloff said he could not approve the deals for the traveling exhibition and merchandising rights until he appoints an attorney to represent the interests of Jackson's three minor children, who along with Katherine Jackson are beneficiaries of the estate.