UPDATE 3:15 p.m. EST: The lockdown and shelter-in-place orders have been lifted, according to the Yale alert system. Police have been going door-to-door on campus searching for the gunman, though authorities will not confirm whether it may have been a hoax.
It's been 50 years since President John F. Kennedy was shot and killed while riding in a motorcade through Dallas, Texas. More words have been written about this event (and its aftermath, and what led up to it) than just about anything else, so we thought we'd take a look back through photographs and video.
After a yearly increase in usage of 17,000 percent, "selfie" was crowned 2013's Word of the Year by Oxford Dictionaries, following last year's winner "gif" and beating out the Miley Cyrus-endorsed "twerk," among others.
On Sunday more than 80 tornadoes tore through the Midwest, killing at least six people in Illinois, injuring dozens more, leveling homes and businesses, and leaving a swath of destruction from Missouri through Michigan.
Just after the school day ended at Brashear High School in Pittsburgh, several gunmen dressed in black shot three students as they were leaving the building. All three victims are alive and in stable condition, receiving treatment at local hospitals.
The U.S. economy, which has been slogging through a long, slow, tepid recovery for years following the Great Recession of 2007-2009, showed several positive signs this week, including higher-than-expected jobs numbers and GDP growth.
UPDATE 2:30 p.m. EST: NBC is reporting that one TSA agent was killed and three others wounded. Airport police shot and may have killed the gunman at the scene. The shooter, whose identity has not been confirmed, was taken into custody after being shot.
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