BBC
Britain and the US are considering boycotting a major international conference in Saudi Arabia after the disappearance Saudi journalist Jamal Khashoggi, the BBC has learned.
Mr Khashoggi, a critic of the Saudi government, vanished on 2 October after visiting its consulate in Istanbul.
The authorities in Istanbul believe he was murdered there by Saudi agents - claims Riyadh has dismissed as "lies".
Donald Trump has said he would "punish" Saudi Arabia if it was responsible.
A number of sponsors and media groups have decided to pull out of this month's investment conference in Riyadh, dubbed Davos in the Desert, as a result of concerns over Mr Khashoggi's fate.
Diplomatic sources have now told the BBC's James Landale both the US Treasury Secretary, Steve Mnuchin, and the UK's International Trade Secretary, Liam Fox, might not attend the event.
A joint statement of condemnation is also being discussed by US and European diplomats if it is confirmed that Mr Khashoggi was killed by Saudi agents.
The conference is being hosted by the kingdom's Crown Prince Mohamed bin Salman to promote his reform agenda.
If neither Mr Mnuchin nor Mr Fox attend, it would be seen as a huge snub by two of Saudi Arabia's key allies.
A spokesman for the UK's international trade department said Dr Fox's diary was not yet finalised for the week of the conference.
UN Secretary General Antonio Guterres earlier told the BBC that once it was clear what had happened to Mr Khashoggi, governments should decide how to react "in the appropriate way".
President Donald Trump has said the US will inflict "severe punishment" on Saudi Arabia if the kingdom is found to be responsible for the death of Mr Khashoggi.
He said he would be "very upset and angry if that were the case", but ruled out halting big military contracts.
"I think we'd be punishing ourselves if we did that," he said. "If they don't buy it from us, they're going to buy it from Russia or... China."
Turkey's foreign minister, Mevut Cavusoglu, said Saudi Arabia was not yet co-operating with the investigation - despite a statement from Saudi Interior Minister Prince Abdulaziz bin Saud bin Naif bin Abdulaziz saying they wanted to uncover "the whole truth".
Mr Cavusoglu has urged the kingdom to allow Turkish officials to enter the consulate.
What is alleged to have happened?
A Turkish security source has told the BBC that officials had audio and video evidence proving Mr Khashoggi, who wrote for the Washington Post, was murdered inside the consulate.
Reports suggest an assault and struggle took place in the consulate after Mr Khashoggi entered the building to get some documents.
Turkish sources allege he was killed by a 15-strong team of Saudi agents.
Turkish TV has already broadcast CCTV footage of the moment Mr Khashoggi walked into the consulate for an appointment at which he was due to receive papers for his forthcoming marriage to Turkish national Hatice Cengiz.
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