美联社新闻一分钟 AP 美国科学家发现生物钟机制获诺奖（在线收听）

This is AP News Minute.

A gunman on the 32nd floor of a Las Vegas hotel casino rained heavy fire down on a crowd of over 22,000 at an outdoor country music festival Sunday night, turning the expanse into a killing ground, from which there was little escape. At least 58 people died in what was the dealiest mass shooting in modern US history. Authorities say at least 515 people were also injured in the attack. The gunman, identified as Stephen Craig Paddock, a 64-year-old retiree, had as many as ten guns with him, including rifles, police said.

President Donald Trump and the First Lady led a moment of silence Monday afternoon on the White House's south lawn to honor the victims of the deadly Las Vegas shooting.

And three Americans won a Nobel Prize for discovering key genetic gears of the body's 24-hour biological clock, the mechanism best known for causing jet lag when it goes awry. The Nobel Assembly awarded the $1.1-million Nobel Prize in Physiology or Medicine to Jeffrey Hall, Michael Rosbach and Michael Young.

Tracy Brown, Associated Press with AP News Minute.