By Nick Hawton
BBC correspondent in Sarajevo
The prosecutor's office at the UN war crimes tribunal has criticised Nato peacekeepers for failing to arrest one of Bosnia's top war crimes suspects.
Nato is said to have had 'good information' about Karadzic
Ex-Bosnian Serb leader Radovan Karadzic has been charged with genocide. He has been on the run for past eight years despite attempts to arrest him.
Nato insists it is doing all it can to arrest Bosnia's war crimes suspects.
But prosecutors say he has been able to remain free partly because Nato has not acted on intelligence provided to them.
The chief spokeswoman for the prosecutor's office at The Hague, Florence Hartmann said they regularly received intelligence on the whereabouts of war crimes suspects from their own tracking units in the region.
This intelligence was passed on to Nato and other organisations, but she claimed, nothing appeared to be done.
On one occasion in February this year, she said they had very good information that Mr Karadzic was in a village on the border between Bosnia and Serbia.
She said Nato was told but nothing was done.
"If they didn't act because they had serious reason not to act, then it's OK," she said.
"If it's for another reason, well we would be concerned, but you should ask them why they didn't act. We tried to be transparent, we were not happy with this experience."
Ms Hartmann also said they had provided information for more than two years on the whereabouts of the former Bosnian Serb commander Ratko Mladic to the authorities in Belgrade, but again no action was taken.
Nato insists it is doing all it can to arrest Bosnia's war crimes suspects, but The Hague for one remains less than convinced.