Brazilian demonstrators staged some of the largest-ever protests calling for President Dilma Rousseff's impeachment and supporting police investigations of the major corruption scandal.
Iran has consistently denied any involvement in the 2001 attacks in New York and Washington, which are widely believed to have been the work of al-Qaida.
Paola Turbay, a former Miss Colombia, reportedly tweeted a play on the similar-sounding Spanish words for "Jewish" and an expletive before tweeting an explanation.