In New York, Virginia and Pennsylvania, mourners gathered to remember nearly 3,000 people killed during the hijackings.
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Gulf
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.
Iran's Foreign Ministry says the meeting in Oman is to 'promote better understanding among the countries of the region'.