21.   Moreover, they would need approval of the United Nations, which has opposed aggressive action for fear of Serb retaliation.

22.   NATO said the arrests could provoke Serb retaliation, and the Serbs suspended contact with the Bosnian government.

23.   NATO said the arrests, severely straining the tenuous peace process, could provoke Serb retaliation.

24.   Rockets slammed into the Croatian capital on Tuesday in apparent Serb retaliation for a strong government offensive that threatened to reignite an all-out Balkan war.

25.   Sarajevans afraid of Serb retaliation with heavy artillery for any government offensive piled sandbags in front of windows and other vulnerable sites.

26.   Sarajevans afraid of Serb retaliation with heavy artillery piled sandbags in front of windows and other vulnerable sites.

27.   Shells fired in apparent Serb retaliation for the Croatian offensive landed in two cities south of Zagreb late Monday afternoon, the Croatian news agency HINA said.

28.   The Albanians of Kosovo had welcomed the NATO airwar, despite Serb retaliation against the local inhabitants, he said.

29.   Such proposals were under consideration, but Annan said officials were concerned that peacekeepers could face Serb retaliation if NATO carried out more aggressive airstrikes.

30.   Such proposals were under consideration, Annan said, but officials were concerned that peacekeepers could face Serb retaliation if NATO carried out more aggressive airstrikes.