FILE PHOTO: SoftBank Group Corp Chairman and CEO Masayoshi Son speaks during their joint news conference with Toyota Motor Corp President Akio Toyoda (not pictured) in Tokyo, Japan October 4, 2018. REUTERS/Issei Kato /File Photo

DUBAI (Reuters) - SoftBank Group Corp 9984.T Chief Executive Masayoshi Son has cancelled a speaking engagement at the Future Investment Initiative conference in Saudi Arabia, said a source close to the matter.

It was unclear whether Son would still attend the event, which started on Tuesday, the source said.

SoftBank did not immediately respond to a request for comment.