From the LA Times and TMZ...
Pop icon Michael Jackson died on Thursday after suffering a cardiac arrest, multiple US media outlets reported, sending shockwaves through the entertainment world.
The Los Angeles Times and TMZ.com celebrity news website reported Jackson, 50, died after suffering an arrest just after 12pm local time (0500 AEST) and paramedics were unable to revive him.
The Times cited multiple city and law enforcement officials as confirming the pop icon's death.
Jackson's manager Tohme E. Tohme was not available for comment. Officials at UCLA Medical Centre where Jackson was treated also could not be reached for comment.
National and local television networks showed hundreds of media gathered at UCLA Medical Centre for what appeared to be a briefing.
Los Angeles Fire Department spokesman Devin Gales did not confirm Jackson's identity but said paramedics went to an address corresponding to the star's home at 12:21pm (0521 GMT) and the person was taken to UCLA Medical Centre.
An unidentified family member earlier told TMZ -- the first outlet to report that Jackson had suffered a cardiac arrest -- that the star was in "really bad shape."
Michael's father Joe Jackson told E! Online he was aware of the emergency but did not know further details.
"I am in Las Vegas, but yes, people in Los Angeles called me and are with Michael and tell me he was taken to the hospital," he said.
"I am not sure what's wrong. I am waiting to hear back from them."
The reports came as Jackson prepared to make a keenly anticipated concert comeback in London, his first series of shows in more than a decade and the first since his 2005 acquittal on child molestation charges.
However those concerts -- billed as the "final curtain" -- had been thrown into doubt after Jackson pushed back the opening dates last month.