The incident occurred about 04:30 local time (12:30 GMT) at the junction of Flamingo and Las Vegas boulevards, police Sgt John Sheahan said.

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Applied Pharmacy on Flamingo Road in Las Vegas sold the anesthetic propofol to Dr. Conrad Murray, Jackson's doctor, a source familiar with the investigation said.

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The sisters enjoyed a resurgence in the 1950s when they were booked at the Flamingo Hotel in Las Vegas, which led to television appearances and more recording.

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"I can't imagine anything more serious than firing a weapon from a moving vehicle into another moving vehicle on a corner such as Las Vegas Boulevard and Flamingo, " Clark County District Attorney Steven Wolfson said Thursday.

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