1.   THE United Nations relief agency UNHCR said yesterday that it would send aid convoys to challenge a Serb blockade of thousands of starving Muslims trapped in eastern Bosnia.

2.   It would stop along the route and attempt to pass the Serb blockade in the morning.

3.   But there is little chance of a mobile clinic of that sort turning up in Bihac while the U.N. cannot even penetrate the Serb blockade to provide food.

4.   Its goal is to aid the peacekeepers in their delivery of food and medicine through Serb blockades to increasingly isolated Bosnian cities.

5.   Residents outwitted the rebel Serb blockade of electricity by running power lines off water wheels they placed in the Drina.

6.   Food stocks are perilously low in the capital because of a Serb blockade of U.N. aid shipments.

7.   SARAJEVO -- UN military operations and humanitarian aid distribution threaten to grind to a halt because of a Serb blockade on fuel, UN officials say.

8.   The reason for the Serb blockade was unclear.

9.   The Serb blockade was apparently a response to the detention Thursday by the Bosnian government of an ethnic Serb employee of the UNHCR.

10.   U.N. military operations and vital humanitarian aid distribution throughout Bosnia threatened to grind to a halt because of a Serb blockade on fuel, U.N. officials warned Saturday.