Residents below the tallest dam in the United States near Oroville in Northern California were ordered to evacuate immediately on Sunday after authorities said an auxiliary spillway was in danger of imminent collapse.
"Immediate evacuation from the low levels of Oroville and areas downstream is ordered," the Butte County Sheriff said in a statement posted on social media. "This in NOT A Drill. This in NOT A Drill. This in NOT A Drill."