London, July 31 : King of Pop Michael Jackson's autopsy report has been delayed until next week, after an initial two-week hold-up.

The toxicology reports, carried out on the `Thriller' hitmaker's body during a post-mortem on June 26, were expected to be released until July 31.

However, the Los Angeles County coroner''s office has confirmed the results are still not ready, reports the Daily Express.

The toxicologists are investigating whether prescription drugs were involved in the star''s death from a cardiac arrest last month June 25.

The county coroner assistant, Ed Winter, has not given a reason for the delayed test results. (ANI)