LONDON- The chief executives of HSBC, Standard Chartered and Credit Suisse CSGN.S have pulled out of a high profile conference in Saudi Arabia next week, the latest business leaders to abandon the event amid widespread concern about the fate of a journalist.

"John Flint will no longer attend Future Investment Initiative," a spokeswoman for HSBC told Reuters. StanChart Chief Executive Bill Winters would also not attend, a bank spokesman said.

Tidjane Thiam, the chief executive of Credit Suisse CSGN.S , has likewise dropped plans to travel to the Oct 23-25 event amidst uproar over the disappearance of Saudi journalist Jamal Khashoggi, a source familiar with the situation told Reuters.

The moves follow similar decisions by JP Morgan & Chase Co JPM.N Chief Executive Jamie Dimon and BlackRock Chief Executive Larry Fink - the first senior bankers to boycott the conference in response to a backlash against the world's top oil exporter. 

Executives from the media and technology industries had already withdrawn from the event after the disappearance of Khashoggi.

Khashoggi, a U.S. resident and Washington Post columnist critical of Riyadh's policies disappeared on Oct. 2 after entering the Saudi consulate in Istanbul.

Turkey believes he was murdered and his body removed. Saudi Arabia has so far denied that, but American news outlets have reported the country is now preparing to acknowledge Khashoggi's death in a botched interrogation.

U.S. Secretary of State Mike Pompeo arrived in Riyadh on Tuesday to discuss the case, which has strained U.S. ties with Riyadh, carefully cultivated by President Donald Trump. Trump has speculated "rogue killers" may be responsible. 

(Reporting By Lawrence White in London and Oliver Hirt in Zurich; Writing by Emma Rumney; Editing by Kirsten Donovan/Keith Weir) ((lawrence.white@thomsonreuters.com; +44 207 542 6137; Reuters Messaging: lawrence.white.thomsonreuters@reuters.net))