Sergeant John Sheahan at the Las Vegas Metropolitan Police Department has described the gun fight which lead up to a huge crash which killed three people on a busy junction.
He said a "rolling gun battle" preceded the crash.
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A fine start to Sunday but rain moves in from the southwest later on.
A second police officer has died after he and a colleague were shot as they scuffled with a suspect in Florida.
Thousands of demonstrators have marched through Boston in opposition to a right-wing rally in the city which was eventually cut short.