1.   Among the sticking points is control over a thin strip of land in northern Bosnia that links Serb holdings in the east and west, a U.S. official said.

2.   Brcko sits astride a narrow land corridor that links Serb holdings in eastern and western Bosnia.

3.   Brcko is located at the narrowest point of the corridor linking Serb holdings in east and west.

4.   Brcko sits astride the narrow corridor that links Serb holdings in western and eastern Bosnia and as such is crucial to them.

5.   Brcko is crucial to the Serbs because it is the narrowest part of a corridor linking their holdings in east and west.

6.   Collapse of the talks could lead to heavy fighting, particularly in the rebel Serb corridor in northeastern Bosnia linking rebel holdings to Serbia proper to the east.

7.   Dodik insisted the town, which straddles a narrow corridor linking Serb holdings in eastern and western Bosnia, must remain in Serb hands.

8.   Early Sunday, artillery battles erupted in northeastern Bosnia near a vital Serb supply corridor linking their holdings in east and west.

9.   Earlier, Bosnian Serb leader Radovan Karadzic said Serbs would retain control over a vital land corridor linking their holdings in western and eastern Bosnia.

10.   For the Serbs, it is the narrowest part of a corridor linking their holdings in east and west Bosnia.