As classes began at a high school in suburban Pittsburgh on Wednesday morning, a 16-year-old student walked through the hallway stabbing and slashing students with two large knives, the authorities said.
A Nevada middle school student shot and killed a math teacher on Monday, then fatally shot himself in front of children who were gathering for class at the beginning of the school day, the authorities said.
A federal appeals court in Manhattan ruled Thursday that the federal statute defining marriage as a union between a man and a woman unlawfully discriminates against same-sex married couples by denying them equal federal benefits.
A class-action lawsuit was filed Thursday against a prominent Baltimore medical institute, accusing it of knowingly exposing black children as young as a year old to lead poisoning in the 1990s as part of a study exploring the hazards of lead paint.
The official in charge of air traffic controllers for the Federal Aviation Administration resigned Thursday after a series of episodes in which controllers across the country slept as airplanes landed.
More than six and a half years after the U.S.-led invasion here that many believed was about oil, the major oil companies are finally gaining access to Iraq’s petroleum reserves. But they are doing so at far less advantageous terms than they once envisioned.