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(CNN) -- Entertainer Michael Jackson is in a coma after being taken to a hospital on Thursday after suffering cardiac arrest, sources briefed on the situation told CNN.

A Los Angeles fire official told CNN that paramedics arrived at Michael Jackson's home after a 911 call.

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Paramedics needed to revive Jackson before taking him to the hospital, sources said.

Brian Oxman, a Jackson family attorney, said he was told by brother Randy Jackson that Michael Jackson collapsed at his home in west Los Angeles Thursday morning.

Family members were told of the situation and were either at the hospital or en route, Oxman said.

Fire Capt. Steve Ruda told CNN a 911 call came in from a west Los Angeles residence at 12:21 p.m.

Ruda said Jackson was treated and transferred to the UCLA Medical Center.

Asked specifics of the patient's condition, he said he could not discuss them because of federal privacy laws.

The music icon from Gary, Indiana, is known as the "King of Pop."

Jackson is the seventh of nine children in a well-known musical family.

At the medical center, every entrance to the emergency room was blocked by security guards. Even hospital staffers were not permitted to enter. A few people stood inside the waiting area, some of them crying.