Detlev Mehlis , the German prosecutor leading the investigation , sent the request last week in a letter to the United Nations secretary general , Kofi Annan .
Kofi Annan /business/person/company United Nations
NNP NNP , DT JJ NN VBG DT NN , VBD DT NN JJ NN IN DT NN TO DT NNP NNPS NN JJ , NNP NNP .
Kofi Annan
PERSON
United Nations
ORGANIZATION
/business/person/company