Jackson fans have been paying tribute to the star all weekend
Relatives of Michael Jackson will seek a second autopsy on the star because they still have unanswered questions about his death, family friends say.
Veteran politician Rev Jesse Jackson, who has been counselling the family, said they were upset the official cause of death might not be known for weeks.
He said the family wanted answers from the star's personal doctor, Conrad Murray, who was with him when he died.
Coroners ruled out foul play after an initial autopsy on the 50-year-old.
But they gave no cause of death, saying the results of toxicology tests could take weeks to come back.
Jackson's family have also spoken of their grief at his death.
We miss Michael endlessly, our pain cannot be described in words
Statement from Jackson's family
In a statement issued by his father Joseph Jackson, the star's relatives called it "one of the darkest moments of our lives".
"It leaves us, his family, speechless and devastated to a point where communication with the outside world seems almost impossible at times," the statement said.
The family also thanked fans for their messages of support.
The Reverend Al Sharpton, a family friend, said that Jackson's relatives were considering the idea of simultaneous global celebrations to commemorate his life.
This was because they wanted people to focus on the entertainer's music rather than his problems, Rev Sharpton said.
'Questions of substance'
A spokesman for the Los Angeles Police Department said investigators had briefly spoken to Jackson's personal doctor, but they wanted to speak to him again.
MICHAEL JACKSON 1958-2009
Full name: Michael Joseph Jackson
Born: August 29, 1958, Gary, Indiana, US
Also known as: The King of Pop, Wacko Jacko
Biggest hits: I Want You Back, Don't Stop Til You Get Enough, Billie Jean, Bad, Black or White, Earth Song
Sold:750 million albums
Earned:$700 million (estimated)