LONDON (Reuters) - WikiLeaks expects to issue an update on its role in helping former United States spy agency contractor Edward Snowden to leave Hong Kong by 1pm Greenwich Mean Time (9pm Singapore time) on Sunday, a spokesman said.

Ms Kristinn Hrafnsson, a spokesman for the anti-secrecy website, said more information would be issued through its Twitter account, @wikileaks.

The group's founder Julian Assange, who has spent a year in Ecuador's London Embassy resisting attempts by Sweden to pursue sexual assault allegations against him, has not made any comment on Snowden leaving Hong Kong, the spokesman added.

"We will have more information within an hour or two," Ms Hrafnsson told Reuters by phone at 11am GMT. "It won't be long. Things are happening very quickly. At this point, I can't add anything to what we have just been putting out on Twitter."

Snowden, charged by the US with espionage, left for Moscow on Sunday.