WASHINGTON (AP) — Two or three Americans and one Briton were among those who attacked a Nairobi shopping mall, Kenya’s foreign minister said Monday.

More than 60 people have been killed in the assault on the upscale mall, which has lasted for three days. The foreign minister, Amina Mohamed, said in an interview with PBS’ “NewsHour” program that the Americans were 18 to 19 years old, of Somali or Arab origin and lived “in Minnesota and one other place” in the U.S. The attacker from Britain was a woman who has “done this many times before,” Mohamed said.