Less than a dozen people attended the low-key ceremony at Hollywood's Forest Lawn Cemetery, where the singer was allegedly interred in Motown records founder Berry Gordy's mausoleum.
Michael's father Joe and sister La Toya are believed to have been the only family members to attend the secret service, which took place six weeks after the star died of a suspected cardiac arrest.
The Jackson family has refused to confirm where Michael has been buried because of fears fans will descend on his grave and even attempt to desecrate or steal his body.
A cemetery source said: “Michael has already been laid to rest, but other than the Jackson family and the management at Forest Lawn, no one knows the exact spot. Staff at the cemetery have been fed several different locations, it’s as if they are hoping to confuse everyone so it can’t leak out. The fear is that thousands of Jackson fans will descend on the cemetery and create a security issue or maybe even damage or deface the grave.”
If the grave's security is threatened, the Jacksons have reportedly identified four other sites - including the star's former home Neverland and a memorial site in Las Vegas – they will consider moving the body to.
Forest Lawn is the final resting place of several celebrities, including Lucille Ball, Liberace and David Carradine.
Michael's grandmother was also buried there in 1990.
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