31.   The U.N. has refused to sanction tougher measures through fear of provoking Serb retaliation.

32.   The U.N. refugee agency resumed aid convoys to refugees Wednesday, two days after suspending them for fear of Serb retaliation if NATO attacked.

33.   The United Nations informed rebel Serbs of the new policy on Sunday, and were anxious that publicity might prompt Serb retaliation.

34.   The threat of Serb retaliation against the United Nations has severely limited the use of NATO air power in Bosnia.

35.   The threat of Serb retaliation against the United Nations has severely limited the use of NATO airpower in Bosnia.

36.   They have promised that their fighters will not attack the Serb troops, but they fear Serb retaliation during the pullout.

37.   They have promised that their fighters will not attack the Serb troops, but they fear Serb retaliation during the pull-out.

38.   Thousands more refugees continue to flee Serb retaliation for the air strikes.

39.   U.N. spokeswoman Maj. Myriam Sochacki said the shelling may have been rebel Serb retaliation for Bosnian government shelling of Vogosca, north of Sarajevo, early Tuesday.

40.   U.N. officials speculated that the shelling could be Serb retaliation for government attacks.