Flash flooding that left at least three dead and one missing in Colorado worsened as torrential rain continued to pound the state.
Thousands have been forced to flee to higher ground as rising water toppled buildings, stranded motorists, cut off remote towns and forced the state's largest university to close.
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Andrew Nay smashed into a family's car with his 4x4 during a road rage chase leaving two young sisters paralysed, a court heard.
Susan Whiting was attacked with a blunt object at the couple's bungalow, wrapped in a shower curtain, and hidden under a bed.
Teenager TJ Khayatan carried out the prank at the San Francisco Museum of Modern Art - and later posted the results on Twitter.