geneva unite nations human right office tuesday condemn attack threats make investigators philippines president rodrigo duterte senior burundian officials last week mr duterte threaten slap u.n. special rapporteur agnes callamard investigate allege extrajudicial kill u.n. human right spokesman rupert colville tell news brief make threat june criticize war drug campaign leave thousands dead add refer remark make visit may unofficial capacity attend academic conference philippine supreme court tuesday begin hear arguments petition declare duterte deadly war drug denounce right group across world unconstitutional 3,900 filipinos kill police call self-defense arm drug suspect resist arrest 16 month-long campaign critics say executions take place zero accountability allegations police reject callamard u.n. special rapporteur extrajudicial kill independent expert report u.n. human right council plan visit philippines last december call refuse accept duterte condition recently also subject tirade online abuse include physical threats appear prolong well-orchestrated troll operation across internet social media colville say condemn treatment ms callamard disrespect show human right council appoint strong term add burundi u.n. right office write bujumbura government demand officials stop threaten prosecution members u.n. commission inquiry find burundian officials high level hold accountable crimes humanity colville say burundi ambassador new york tell u.n. general assembly inquiry report bias politically motivate threaten bring justice author defamation attempt detribalization say burundi elect member 47-member human right council main u.n. right forum state cooperate mandate establish council none establish without good cause colville say u.n. rebuke philippines president duterte burundi officials threats