Whistle-blowing website Wikileaks has said that the detention of an alleged confidential source by the US military does not compromise its work.
Wikileaks founder Julian Assange told BBC News that other potential whistle-blowers should not be put off from sending material to the site.
The US has detained US military analyst Bradley Manning on suspicion of leaking classified material to the site.
Mr Assange would not confirm whether Mr Manning was a source.
“We endeavour to protect our sources,” he told BBC News. “We do not know if Mr Manning is a source, but we understand there are allegations that are being taken seriously so we are naturally inclined to try to defend [him].”