Pop star Michael Jackson has died in Los Angeles, aged 50.

Paramedics were called to the singer's Beverly Hills home at about midday on Thursday after he stopped breathing.

He was pronounced dead two hours later at the UCLA medical centre. Jackson's brother, Jermaine, said he was believed to have suffered a cardiac arrest.

Jackson, who had a history of health problems, had been due to stage a series of comeback concerts in the UK on 13 July.

Speaking on behalf of the Jackson family, Jermaine said doctors had tried to resuscitate the star for more than an hour without success.

He added: "The family request that the media please respect our privacy during this tough time."

"And Allah be with you Michael always. I love you."

TV footage showed the star's body flown from UCLA to the LA County Coroner's office where a post-mortem is expected to take place on Friday.

Concerns were raised last month when four of Jackson's planned comeback concerts were postponed, but organisers insisted the dates had been moved due to the complexity of staging the show.

A spokeswoman for The Outside Organisation, which was organising the publicity for the shows, said she had no comment at this time.