The Los Angeles County Coroner's Office announced on Monday that it has completed its investigation into pop star Michael Jackson's death.

But the office said it will not release details at the behest of the Los Angeles Police Department (LAPD) which is continuing its probe.

"The investigation was thorough and comprehensive," the office said in a statement. "The Los Angeles Police Department continues to investigate the events and related circumstances surrounding the death of Mr. Jackson."

"To maintain the integrity of its ongoing investigation, the Los Angeles Police Department has requested a continuance of the existing 'security hold' on all Department of Coroner documents related to the Jackson investigation," the statement said.

"Further, the (LAPD) has requested that the autopsy findings regarding the cause and manner of death remain confidential," it added.

Meanwhile, the LAPD said in a statement that extending the confidentiality of the autopsy findings "will help maintain the integrity of the investigation and allow investigators from LAPD's Robbery Homicide Division, as well as our partner law enforcement agencies, to continue their investigation."

The statement said the investigation being conducted by the LAPD has included dozens of individual interviews and the service of search warrants locally and out of state.

It was widely believed that Jackson had been given propofol, a sedative known by the brand name Diprivan, which doctors say should not be administered except by an anesthesiologist in a hospital setting.

Media reports have quoted law enforcement sources as saying that Jackson was given propofol the night he died. A former Jackson nurse said the singer requested the drug to help him sleep.

Dr. Conrad Murray, a cardiologist who was serving as Jackson's personal physician, is an apparent focus of the police investigation. Investigators served warrants in recent weeks at Murray's office and a storage unit in Houston and at his home and office in Las Vegas.

Jackson apparently used more than two dozen aliases to obtain drugs with the help of doctors. Nineteen aliases have been cited in the affidavits used to secure search warrants against Murray.

The warrants also indicated that police were investigating whether the "offense of manslaughter" had been committed.

Jackson died on June 25 at his rented Holmby Hills mansion in Los Angeles at 50, just days before he was to perform a series of concerts in London.

(Xinhua News Agency August 11, 2009)