[Updated at 3:15 p.m.: Pop star Michael Jackson was pronounced dead by doctors this afternoon after arriving at a hospital in a deep coma, city and law enforcement sources told The Times.]

Michael suffered a cardiac arrest earlier this afternoon at his Holmby Hills home and paramedics were unable to revive him. We're told when paramedics arrived Jackson had no pulse and they never got a pulse back.

A source tells us Jackson was dead when paramedics arrived. LaToya ran in the hospital sobbing, after Jackson was pronounced dead.

Jackson was pronounced dead today after paramedics found him in a coma at his Bel-Air mansion, city and law enforcement sources told The Times.

Los Angeles Fire Department Capt. Steve Ruda told The Times that paramedics responded to a 911 call from the home. When they arrived, Jackson was not breathing. The paramedics performed CPR and took him to UCLA Medical Center, Ruda said.

Hundreds of reporters gathered at the hospital awaiting word on his condition. The sources, who spoke on the condition that they not be named, said family members rushed to Jackson's bedside, where he was in a deep coma.

The circumstances of Jackson's death remain unclear. Law enforcement sources said that Los Angeles Police Department robbery-homicide detectives have opened an investigation into the death, though they stressed there is no evidence of criminal wrongdoing. The detectives plan to interview relatives, friends and Jackson's doctors to try to figure out what happened. The L.A. County coroner's office will determine a cause of death.

A Los Angeles Fire Department source told The Times that Jackson was in full cardiac arrest when rescue units arrived on scene. A doctor was in the house performing CPR on him, said the source, who asked not to be named because he was not authorized to speak to the media.

Michael is survived by three children: Michael Joseph Jackson, Jr., Paris Michael Katherine Jackson and Prince “Blanket" Michael Jackson II. Jackson had 13 number one hits during his solo career.