An advisor to chief United Nations war crimes prosecutor Carla del Ponte says she will criticize Serbia's lack of cooperation with the Hague war crimes tribunal when she reports to the Security Council Thursday.

Anton Nikiforov made his comments in The Hague as Ms. del Ponte prepared to deliver her assessment to the council.

Tribunal Official Says UN Prosecutor's Report Will Be Critical of Serbia

Anxious to display cooperation, authorities in Serbia and Montenegro last week gave the prosecutors a secret file on top fugitive war crimes suspect General Ratko Mladic, including a number of pages they earlier had withheld.

Tribunal Official Says UN Prosecutor's Report Will Be Critical of Serbia

But Mr. Nikiforov said the file still lacked such important information as the general's promotion record during the mid-1990s in the midst of the conflict in Bosnia-Herzegovina.

Tribunal Official Says UN Prosecutor's Report Will Be Critical of Serbia

The Hague tribunal indicted the general in 1995 on charges involving his role in attacks on civilians during the Bosnian conflict.