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Michael Jackson, who was with a cardiologist when he collapsed at his rented home in Los Angeles, appeared to have suffered a heart attack, a person with knowledge of the situation told The Associated Press.

The person, who was not authorized to speak publicly and requested anonymity, said Jackson suffered a heart attack, which is a blocking of the arteries that deprives the heart of adequate blood. That can lead to cardiac arrest, an interruption of the normal heartbeat.