Last week, loud popping sounds triggered a frightening chain of events at J.F.K. Airport. Mass panic spread through two terminals as travelers ran toward exits, sought cover under tables, and broke ...

Immediately after a 19-year-old shot and killed 17 people and wounded 17 others at a Florida high school on Valentine’s Day, people leaped to explain what had caused the latest mass slaughter. By now, ...

Just days after a gunman opened fire in a gay club in Orlando, Florida, a complex and sometimes contradictory picture of his motivations is emerging. He called 911 during the attack to pledge ...