By Eric Onstad

THE HAGUE (Reuters) - The United States pledged Friday to speed up the flow of evidence on alleged Serbian war crimes in Kosovo to U.N. tribunal prosecutors.

``We have discussed ways for the United States to improve the timely delivery of information about events in Kosovo to the office of the prosecutor,'' U.S. Assistant Secretary of State Harold Koh told a news conference at the U.N. Yugoslavia tribunal in The Hague.

Tribunal Chief Prosecutor Louise Arbour said she had held talks at NATO headquarters last week and was satisfied the U.N. court would obtain the information it needed.

``We have now had a very useful dialogue with a lot of our information providers so that there is a much better understanding of what our needs are,'' she said after holding talks with Koh.

Governments would help coordinate the questioning of ethnic Albanian refugees streaming out of the strife-torn southern Serbian province and look into providing intelligence data to the tribunal, she said.

Last week prosecutors at the International Criminal Tribunal for the former Yugoslavia said more could be done to provide evidence quickly after members of the NATO alliance gave vivid descriptions of alleged war crimes by Serbian troops in Kosovo.

Koh, the chief human rights official in the Clinton administration, said the United States was working to make sure that non-governmental organizations asked a standardized set of questions to refugees flowing from Kosovo.

A U.S. grant went to the American Bar Association's Coalition for International Justice to help it document human rights violations in Kosovo, he added.

``American government support for this unprecedented collaboration to document these cases will help ensure that all potential sources of evidence will be tapped and that those who commit these crimes will be held responsible,'' he said.

Arbour said statements by NATO member states referring to evidence of horrific war crimes in Kosovo had put heavy pressure on the tribunal.

``I think we might have expressed in the past a little bit of frustration that this created immense expectations that we would then deliver immediately the product of evidence,'' Arbour said.

``Where I sit it looks much different. Information is one thing, evidence is something completely different,'' she added.

Koh was asked why Yugoslav President Slobodan Milosevic had not been included in a list of army commanders the U.S. government said earlier this month it regarded as war criminals.

``That's not to say other names might not be forthcoming, that other kinds of statements might be made in the future,'' Koh replied.