NEW YORK - A doctor who worked in West Africa with Ebola patients was in an isolation unit in New York City on Friday after testing positive for the virus, becoming the fourth person diagnosed with the disease in the United States and the first in its largest city. | Video
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LONDON/NEW YORK - U.S. drugmaker Pfizer is to continue buying back stock, with the board authorizing a new $11 billion share repurchase plan, deflating expectations that it will make a new bid for AstraZeneca.
OTTAWA - Canada's capital faced a third day of heightened security on Friday as police searched for any clues that the man who shot and killed a soldier and charged into the parliament building had help in plotting his attack. | Video
WASHINGTON - Three people were killed and two taken to hospital after a small airplane and a helicopter crashed into each other on Thursday near an airport in Frederick, Maryland, authorities said.
MACDILL AIR FORCE BASE Florida - Iraqi forces are months away from being able to start waging any kind of sustained ground offensive against the Islamic State and any similar effort in Syria will take longer, officials at the U.S. military's Central Command said on Thursday.