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Agnes Callamard, the United Nations special rapporteur on extra-judicial executions, said on Wednesday that the "state of Saudi Arabia is responsible" for the "extra-judicial" killing of Saudi journalist Jamal Khashoggi.

Speaking to the UN Human Rights Council, whose 47 member states including Saudi Arabia will give their opinions on how to proceed next, Callamard said Khashoggi's murder was "endorsed by high-level (Saudi) officials."

The 15 agents involved in the slaying used "state means" to carry out the execution, which also required "significant human and financial resources," Callarmard said.

Khashoggi was last seen entering the Saudi consulate on October 2. He is believed to have been brutally murdered and dismembered there but his remains have not yet been found. Saudi Arabia has vehemently denied any involvement and blamed rogue agents.

But the UN special rapporteur rejected Saudi Arabia's claim that the matter was a domestic one only, stressing that as it took place in Turkey, the killing "constitutes an international crime" as well as "a violation of the Vienna Convention."

She added that the Saudi investigation had "failed to address the chain of command" and reiterated that she had found "credible evidence warranting further investigation" into the involvement of Crown Prince Mohammed Bin Salman.

She also highlighted that while she has held meetings in Turkey, the US, Germany, UK and Sweden for her investigation, "to date I have received no response" to hold meetings in Saudi Arabia.

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