WikiLeaks Founder Warns About More Dispatches

On Monday, as Mr. Assange’s lawyers said he would meet with the British police about criminal charges involving sexual encounters in Sweden, Attorney General Eric H. Holder Jr. said the Justice Department had “a very serious, active, ongoing investigation that is criminal in nature” into the WikiLeaks matter.

“I authorized just last week a number of things to be done so that we can hopefully get to the bottom of this and hold people accountable,” he said at a news conference, declining to elaborate.

Mr. Holder repeated assertions by several Obama administration officials about the damage done by the cable disclosures, which began late last month.

“The national security of the United States has been put at risk; the lives of people who work for the American people have been put at risk; the American people themselves have been put at risk by these actions that are, I believe, arrogant, misguided and ultimately not helpful in any way,” Mr. Holder said.

Justice Department prosecutors have been struggling to find a way to indict Mr. Assange since July, when WikiLeaks made public documents on the war in Afghanistan. But while it is clearly illegal for a government official with a security clearance to give a classified document to WikiLeaks, it is far from clear that it is illegal for the organization to make it public.

The Justice Department has considered trying to indict Mr. Assange under the Espionage Act, which has never been successfully used to prosecute a third-party recipient of a leak. Some lawmakers have suggested accusing WikiLeaks of receiving stolen government property, but experts said Monday that would also pose difficulties.

WikiLeaks’ operations have been hampered in recent days as computer server companies, Amazon.com and PayPal.com, have cut off commercial cooperation.

On Monday, a Swiss bank froze an account held by Mr. Assange that had been used to collect donations for WikiLeaks. Marc Andrey, a spokesman for the bank, PostFinance, an arm of the Swiss postal service, said the account was closed because Mr. Assange “gave us false information when he opened the account,” asserting inaccurately that he lived in Switzerland.