Michael Jackson was rushed to a Los Angeles hospital Thursday afternoon, police told FOX News, but his condition wasn't immediately clear.
TMZ reported that the legendary singer, 50, went into cardiac arrest and had to receive CPR in the ambulance. Joe Jackson, his father, told multiple news sources that his son is not doing well.
Paramedics responded to a 911 call at around 12:26 p.m. PDT, the Los Angeles Times reported. He was reportedly not breathing at the time of their arrival.
A Jackson spokesman was unavailable for comment.
Jackson, the youngest brother in Motown's legendary Jackson 5, earned the name 'King of Pop' as a solo act in the 1980s, when he became one of the best-selling musicians in the world, particularly for the hit album "Thriller."
His star power has faded considerably since then, partly because of allegations of child molestation.