Amazon CEO Jeff Bezos Jeffrey (Jeff) Preston BezosTwitter mandates lawmakers, journalists to beef up passwords heading into election Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Amazon planning small delivery hubs in suburbs MORE posted a tribute to slain Washington Post columnist Jamal Khashoggi on Wednesday in his first public message after reports linking a hack of his phone to Saudi efforts to affect coverage of the murder.

"#Jamal," Bezos tweeted, along with a photo of the Amazon executive and Washington Post owner with Khashoggi's fiancée at a memorial outside of the Saudi Consulate in Turkey, where Khashoggi was murdered.

The Guardian first reported on Tuesday that Saudi Crown Prince Mohammed bin Salman gained access to Bezos’s phone via a WhatsApp message.

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Two United Nations human rights experts on Wednesday linked that hacking to an effort to influence the Post's coverage of Khashoggi's murder.

Agnes Callamard, U.N. special rapporteur on summary executions and extrajudicial killings, and David Kaye, U.N. special rapporteur on freedom of expression, called for further investigation into the issue.

"The information we have received suggests the possible involvement of the crown prince in surveillance of Mr. Bezos, in an effort to influence, if not silence, The Washington Post's reporting on Saudi Arabia,” they said in a statement, not revealing the source of the information.

Saudi Arabia has denied the hacking.

“Recent media reports that suggest the Kingdom is behind a hacking of Mr. Jeff Bezos' phone are absurd,” the country's U.S. embassy tweeted. “We call for an investigation on these claims so that we can have all the facts out."

Amazon has not responded to requests for comment on the alleged hacking.

Sen. Ron Wyden Ronald (Ron) Lee WydenGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high Republican Senators raise concerns over Oracle-TikTok deal Hillicon Valley: TikTok, Oracle seek Trump's approval as clock winds down | Hackers arrested for allegedly defacing U.S. websites after death of Iranian general | 400K people register to vote on Snapchat MORE (D-Ore.) on Wednesday sent a letter to Bezos asking for information related to the alleged hack, including reports, if any, from cybersecurity experts retained by Bezos who examined his phone.