Asked about accounts from the Organization for Security and Cooperation in Europe that corroborated the reported Yugoslav attack, Vujovic said the OSCE was biased.

CNN: Serb troops cross into Albania, officials say

Pilots were hampered by poor weather, but were still able to attack Yugoslav troops in Kosovo, Marani said.

CNN: NATO pounds Serb political party as leaders gather for summit

Pentagon sources said many refugees who arrived in Albania on Wednesday afternoon told U.N. workers that they had come under attack by Yugoslav aircraft on the road from Prizren to the Albanian town of Kukes.

CNN: Convoys of Kosovo Albanians bombed; 85 dead

Military sources told CNN one of the main sticking points is that the Yugoslav leadership is concerned Kosovo Liberation Army rebels will attack Serb forces from the rear once the withdrawal begins.

CNN: NATO, Yugoslavs hold marathon talks

In Belgrade, the Yugoslav parliament cut short its session in protest at the terrorist attack, which it described as an act of terrorism aimed at destabilising the area.

BBC: Serbs die in Kosovo bus blast

Yugoslav officials denied there was any incursion -- claiming its forces have been under attack in the area by Kosovo Liberation Army rebels.

CNN: EU, U.N. leaders to hold summit on Kosovo crisis