31.   Bu the bull run has worried market officials who fear some investors are blind to the risks of share trading.

32.   But heavy fighting there on Wednesday between government and Bosnian Serb forces worried U.N. officials because it was between parties to the truce.

33.   But it is spreading in Pakistan, which worries health officials.

34.   But the mysterious bacterial substance had officials worried enough to lock up the office tower just blocks from Parliament Hill.

35.   EU officials were also worried by the growing gap between inflation rates in various euro-zone nations.

36.   German officials were worried by recent Russian statements warning of threats to peace if NATO expands.

37.   Recent clashes between Serbs and Croats in Drvar and Derventa, and between Muslims and Serbs near Doboj, worry officials.

38.   Recent clashes in Bosnia between Serbs and Croats in Drvar and Derventa, and Muslims and Serbs near Doboj, worry officials.

39.   That has UMDNJ officials worried.

40.   The deaths of two hospital workers have health officials worried that hemorrhagic dengue fever might be spreading in the Gulf coast state of Veracruz.