The gunmen first detonated a car bomb outside the Corinthia Hotel, killing the three guards. At least three of the attackers then stormed the luxury hotel, fighting with security forces who tried to evacuate guests.
Obama's visit comes as Washington struggles with worsening strife in the Middle East and counts Saudi Arabia among its few steady partners in a campaign against Islamic State militants who have seized swathes of Iraq and Syria.
So-called "asymptomatic" Ebola cases - in which someone is exposed to the virus, develops antibodies, but doesn't get sick or suffer symptoms - are hotly disputed among scientists, with some saying their existence is little more than a pipe dream.
A life-threatening blizzard barrelled into the U.S. Northeast, affecting up to 20 percent of Americans as it kept workers and students housebound, halted thousands of flights and prompted New York to ban cars from roads and shut down subway trains.
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