A land mine exploded near a Red Cross relief convoy, forcing the trucks to turn back before reaching 150,000 Muslims in TESANJ cut off by fighting since June 1.
The United Nations said Serb forces besieging SARAJEVO pounded Muslim front lines with 150 shells overnight. Muslim-controlled Sarajevo radio reported the areas around MAGLAJ, TESANJ and DOBOJ were shelled by Serb and Croat forces.
In a sign of conciliation, the foreign ministers of Bosnia and Croatia agreed to exchange all prisoners starting Thursday.
U.N. aid officials warned that the operation to feed 2.7 million people in Bosnia was facing grave difficulties because of obstructions and donor countries' lack of commitment.