Four officers were killed Monday while trying to serve a warrant in Charlotte, North Carolina. The suspect, who was also killed, opened fire from the top floor of a house as the officers approached. Dave Malkoff has more on the slain officers.
Former presidential nominee and ex-Utah senator Mitt Romney said his family is "heartbroken" after his sister-in-law was found dead on the street in a Los Angeles suburb....
The Army launches the Janus Program with hundreds of millions in funding over five years to install commercial microreactors at military bases worldwide....