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Police believe Christopher Carrillo, 25, shot and killed four family members before killing himself on the south side Tucson Tuesday evening.
The military is searching for the missing Marine Corps helicopter, which disappeared over Charikot, Nepal, on Tuesday during an aid mission.
The engineer of the Amtrak train that derailed in Philadelphia has been released from the hospital and was identified Wednesday as Brandon Bostian.
U.S. Colonel John Armellino tells NBC's Katy Tur that U.S. military and its allies are still searching for 6 missing marines in Nepal.
The NTSB says AMTRAK has an Advanced Civil Speed Enforcement System installed throughout much of the Northeast Corridor. The system is designed to keep trains below maximum speed. However ACSES is not installed on the section of track near Philadelphia where Tuesday's accident occurred.
Matt Munzo was near the site of the Amtrak derailment when it skipped the tracks in the deadly accident.
A jury in Boston began deliberating Wednesday whether to sentence Dzhokhar Tsarnaev to the death penalty, or life in prison.
After a below-average crash rate in 2012, Amtrak trains have wrecked at a steadily higher rate — and are now worse than the national average.
Senate leadership could vote early next week on giving President Obama "fast-track" authority to negotiate a massive 12-nation trade pact.
