61.  But Bosnian Croat military sources said NATO jets hit Serb positions on Mount Ozren south of Doboj and other targets.

62.  But on Wednesday morning, two British armored vehicles on Igman came under anti-aircraft and mortar fire from Serb positions.

63.  But U.N. military spokesmen indicated the Serb position was tenuous at best.

64.  But Serb positions are not far away.

65.  But Wednesday morning, two British armored vehicles on Igman came under anti-aircraft and mortar fire from Serb positions.

66.  Canadian peacekeepers serving with the United Nations in Bosnia-Herzegovina are detained by Bosnian Serbs after NATO planes bomb Serb positions in Bosnia and Croatia.

67.  Chavancy said the shell was fired from a Serb position.

68.  Christopher also sharply criticized the United Nations for not authorizing sustained air strikes by NATO warplanes on Serb positions near Bihac.

69.  Clinton administration officials said they feared a new Bosnian onslaught against Serb positions surrounding Sarajevo could lead to the collapse of the U.N. peacekeeping operation.

70.  Christopher said it would have been useless to approve carpet bombing by NATO aircraft on Serb positions.