An American citizen was allegedly tortured while in custody in Saudi Arabia, according to a report by the New York Times.

Walid Fitaihi described being dragged from his room in Riyadh's Ritz Carlton hotel, where he was being detained, then told a friend he was "blindfolded, stripped of his underwear and bound to a chair," the report said.

The Harvard-trained doctor was then reportedly shocked with electricity in "what appears to have been a single session of torture that lasted about an hour", the daily reported.

It also said he was whipped so severely, he could not sleep on his back for days.

Mass arrests

Fitaihi, who holds dual American-Saudi citizenship, was one of several hundred prominent Saudis rounded up in mass arrests in November 2017 in an anti-corruption crackdown ordered by Saudi Crown Prince Mohammed bin Salman (MBS).

As with many others, the charges against Fitaihi have not been disclosed and there has been no known trial. He remains in detention.

A number of those who were caught up in the round-up also alleged torture, including electric shocks, charges the kingdom has denied.

Fitaihi's American citizenship could further complicate relations between Saudi Arabia and the United States.

In December, the US Senate voted unanimously on a non-binding resolution that blamed the MBS for the brutal murder of prominent Saudi journalist, Jamal Khashoggi.

Khashoggi was murdered on October 2 in the Saudi consulate in Istanbul by a group of Saudi agents. US intelligence agencies reportedly believe MBS ordered the murder, an allegation the kingdom denies.

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A group of US Senators introduced a legislation on Tuesday that would require the US Director of National Intelligence to submit a public report on the assassination.

Khashoggi had protested Fitaihi's detention in Saudi Arabia in a tweet in January 2018.

"What has happened to us?" Khashoggi wrote in Arabic. "How can someone like Dr Walid Fitaihi be arrested and what are the justifications for it?"

مالذي اصابنا ؟ كيف يعتقل شخص كالدكتور وليد فتيحي وما مبررات ذلك ؟ وبالطبع الجميع في عجز وحيرة ، لا احد تذهب اليه فتشفع ، ولا نائب عام يجيبك فتتحقق ، الله المستعان .@Walidfitaihi pic.twitter.com/hFzmRm5xVQ — جمال خاشقجي (@JKhashoggi) January 29, 2018

The NYT report says Dr Fitaihi's American friends are "stepping up a campaign to press Washington to take up his case".

US President Donald Trump has defended MBS in the wake of the Khashoggi murder and continued relations with the kingdom.

On Tuesday, senior White House adviser and Trump's son-in-law Jared Kushner met MBS for the first time since Khashoggi's murder. It was not mentioned in the White House statement on Kushner's meeting.

Trump distanced himself from the Khashoggi murder in part, he said, because the journalist was not a US citizen.

End of anti-corruption campaign

MBS has defended the 2017 anti-corruption campaign as "shock therapy" to overhaul the Saudi economy.

When the campaign ended in January, a royal court said authorities had summoned 381 people, some as witnesses, but it provided no names.

It said 87 people confessed to charges against them and reached settlements that included the forfeiture of real estate, companies, cash and other assets.

The public prosecutor refused to settle the cases of 56 people due to existing criminal charges against them. Eight more who declined settlement offers stand accused of corruption, the court said.