Updated

WikiLeaks, the document-leaking website that has come under intense pressure after publishing classified U.S. military documents, is facing a new challenge: competition.

A group that includes former WikiLeaks staffers who left the organization after disagreements with founder Julian Assange is pursuing plans for a rival document-leaking venture, said people familiar with their plans.

These people said one of the leaders of the new initiative is Daniel Domscheit-Berg, a top WikiLeaks lieutenant who quit in September. Mr. Domscheit-Berg, a German, is planning to launch new technology to assist whistle-blowers who want to leak documents, said people with knowledge of the matter.

"There is some indication that Daniel and some others are setting up a similar venue, and we wish them luck," said Kristinn Hrafnsson, a WikiLeaks spokesman, in a recent interview in London. "It would be good to have more organizations like WikiLeaks."

Another site that publishes leaked documents and top-secret information is cryptome.org, which among other things has published leaks about WikiLeaks. Secrecy News, a blog written by the scientist Steven Aftergood, publishes government documents about the military, diplomacy and other matters.

Mr. Hrafnsson said another WikiLeaks insider, a "technician," also quit the group and that "two or three volunteers" have left. He declined to identify them. He said reports of friction within WikiLeaks are "quite overblown."

Read more at the Wall Street Journal