The son of slain journalist Jamal Khashoggi has shaken hands with Saudi Arabia's Crown Prince Mohammed bin Salman, the man accused of orchestrating his father's killing.

Key points: British PM Theresa May said the reports that parts of Khashoggi's body have been found are "disturbing"

British PM Theresa May said the reports that parts of Khashoggi's body have been found are "disturbing" The Saudi King and Crown Prince met the journalist's family to offer condolences

The Saudi King and Crown Prince met the journalist's family to offer condolences The US has revoked the visas of Saudi officials implicated in the death

The photo op in Riyadh came as more details emerged of what Turkish authorities say was a Saudi hit squad's premeditated murder of the dissident journalist.

Britain's Sky News, citing two sources, reported that parts of Khashoggi's body had been found in Istanbul.

Sky said one source said the remains were in the garden of the Saudi Consul General's home, located 500 metres from the consulate.

British Prime Minister Theresa May called the reports "disturbing".

"I am aware of the reports, they are deeply disturbing … the location of Mr Khashoggi's body is just one of the questions we need answers to and as such we await the full results of the Turkish investigation," a spokesperson for Ms May said.

Turkish state media said investigators found three suitcases, a laptop computer and clothing inside a car belonging to the Saudi consulate.

In Riyadh, Saudi King Salman and the Crown Prince met the journalist's son, Salah, and his brother, Sahel, at the Yamama Palace, and expressed their condolences.

A friend of the Khashoggi family said Salah has been under a travel ban since last year. The individual spoke on condition of anonymity to the AP news agency, fearing reprisal.

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US revokes visas of Saudi officials

US Secretary of State Mike Pompeo says the Trump administration is revoking the visas of some Saudi officials implicated in the death of Khashoggi.

Mr Pompeo announced the step at a State Department news conference on Tuesday (local time). Vice-President Mike Pence said earlier that Khashoggi's death at Saudi Arabia's consulate in Istanbul "will not go without an American response".

The visa revocations are the first punitive measures taken by the administration against the Saudis since Khashoggi disappeared.

Visa records are considered confidential and Mr Pompeo did not say which or how many Saudi officials would have their visas revoked.

Saudis admit team was sent to Istanbul

Facing global outrage over Khashoggi's killing, Saudi officials are now acknowledging that the journalist was targeted inside the Istanbul consulate in Turkey and a body double was on hand to aid in a cover-up.

The new version of events, described to AP by two Saudi officials, comes three weeks after the kingdom said Khashoggi left the consulate on his own and insisted Turkish claims he was killed by an assassination squad were unfounded.

Now Saudi officials say they did in fact send a team to Turkey that included a forensics expert and a member whose job was to dress in the 59-year-old writer's clothes and pretend to be him — though they still insist that his death was an accident.

Khashoggi, a US resident who wrote for the Washington Post, had gone to the consulate to get papers for his upcoming wedding.

Saudi writer Jamal Khashoggi and his fiancee, Hatice Cengiz, at an apartment building in Istanbul, Turkey. ( AP: A News )

Prince Mohammed, the de facto ruler of Saudi Arabia, has come under mounting pressure, with critics suspecting he ordered the high-profile operation or at least knew about it. Saudi authorities say they have arrested 18 suspects and dismissed senior officials.

The Prince appeared briefly at an afternoon panel Tuesday alongside Jordan's King Abdullah II, but made no public remarks.

Turkish crime scene investigators leave an underground car park after looking for clues. ( AP: Emrah Gurel )

He said three operatives arrived in Istanbul the day before on an apparent reconnaissance mission. The next day 15 people came to the consulate.

Mr Erdogan alleged the group travelled to the consulate and called the journalist to confirm his appointment to seek documentation he needed to marry his fiancee.

"The first thing they did was remove the hard disk and camera of the consulate," Mr Erdogan said.