In New York, Virginia and Pennsylvania, mourners gathered to remember nearly 3,000 people killed during the hijackings.
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UAE
The capture by the rebels of a stretch Yemen's strategic coastline is the group's most impressive military coup for several years.
Trump drew parallels to the US's present-day war against Iran, while figures like Abdul El-Sayed called for inclusivity.
Houthis were already able to disrupt shipping - their advance consolidates that power, and exposes government weakness.
France international and World Cup record holder Kylian Mbappe speaks out over memes using his image.