The wife of an American professor was killed and five others injured in a knife attack in central London's Russell Square in what police Thursday called a "spontaneous" assault.London Metropolitan police identified her as Darlene Horton, 64.She was married to a Florida State University professor, the university said. Richard Wagner, a professor of psychology, and Horton were in London, where he taught a summer session for the university. The couple had planned to return to Tallahassee on Thursday.The stabbings late Wednesday night rattled the city popular with tourists and came just hours after authorities announced an increased police presence，there following recent terror attacks across Europe.Police said they had arrested a 19-year-old man on suspicion of murder. The suspect is a Norwegian national of Somali origin, and "so far we have found no evidence of radicalization," London Metropolitan Police Assistant Commissioner Mark Rowley said Thursday.
 

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