The aviation accident, which occurred on Wednesday night, is under investigation, the 101st Airborne Division said.

© Sharon Johnson/Associated Press

The police said the gunman, who turned himself in, and the victims had “previously engaged in conflict over social media.” The shooting was captured on video.

© Madeline Carter/Las Vegas Review-Journal, via Associated Press

States across the border issued air advisories about particulate pollution that are expected to last for several days.

© The New York Times