LONDON — The conviction of Pfc. Bradley Manning shows that journalists must fight to keep their sources safe, WikiLeaks founder Julian Assange said Tuesday, urging other media organizations to follow his group's lead in advocating aggressively on leakers' behalf.

In an interview with reporters in London following Manning's conviction on espionage and other charges, Assange said it was incumbent on every media organization to stand shoulder-to-shoulder with their sources against government efforts to prosecute leakers.

"It is an obligation on all journalists to protect their sources — technically if possible — and provide some legal and political support," he said. "It's an obligation of all journalistic organizations to hold the line."

Assange spoke to reporters from the Ecuadorean Embassy, where he has been holed up for more than a year to avoid being extradited to Sweden on sex crimes allegations — or to the United States to be prosecuted for publishing government secrets.

Striking a somber tone in a dark suit and tie, the 42-year-old WikiLeaks founder condemned the verdict handed down Tuesday, but he and others had long anticipated the Army analyst's conviction, arguing that the military justice system was stacked against him from the start.

Assange said he took no comfort from Manning's acquittal on the most serious charge — aiding the enemy — saying it was a "red herring" intended to distract from his conviction on nearly every other charge, including counts of espionage, theft and computer fraud.

"It can never be that supplying true information to the public is espionage," Assange insisted, describing the conviction as a hideous precedent that would spell the "end of national security journalism in the United States."

Assange also worried that judgment had helped lay the ground for his own eventual prosecution in the United States, adding that — although Manning himself admitted passing hundreds of thousands of classified documents to WikiLeaks — the group was still steering clear of claiming him as its source.

Nevertheless, he was full of praise for the young private, calling him a "hero" who'd put his liberty and his life on the line to expose wrongdoing.

He said that — despite dire American warnings of catastrophic damage dealt by the leaks — the U.S. had yet to identify a single person hurt by the leaks.

"Not a single person came to harm as the result of Bradley Manning's activities," he said. "The only victim was the U.S. government's wounded pride."