During an interview on PBS Newshour on Monday, Kenyan Foreign Minister Amina Mohamed claimed that foreign nationals, including “two or three Americans” and “one Brit,” were among the terrorists who attacked Nairobi’s Westgate mall on Saturday, killing more than 60 people and injuring around 200. The assertion was also made by Kenya’s police chief-of-staff General Julius Karangi, who said that the terrorists, members of the Somali militant group al-Shabab, were a “multinational collection from all over the world.” Mohamed told PBS that the American gunmen had spent time in Minnesota, were aged 18 or 19, and of Somali or Arab...