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 Some British and European counterterrorism officials have raised concerns that at least two of the bombers might have been known to the police as part of two sprawling terrorism investigations in 2004 : the investigation of an alleged attempt in the spring to build an enormous fertilizer bomb to strike somewhere in London , and the arrest of a small cell of men in August who were accused of plotting to attack financial buildings in Manhattan , Newark and Washington , D.C. Questions have been raised , for example , why domestic intelligence agents did not determine that Mohammad Sidique Khan , one of the four bombers , was a threat to national security in 2004 . 
 place of death: Mohammad Sidique Khan, London
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: nationality, country capital, place of death, children, location contains, place of birth, place lived, administrative division of country, country of administrative divisions, company, neighborhood of, company founders 
Text: {0} 
Answer:
 place of death: Mohammad Sidique Khan, London