It has been halted several times because of artillery and mortar fire from Serbian units in the hills around the city.

Thus, after 1823 Greeks enlisted in Serbian units and vice versa.

Local Serbian politicians denied that Serbian units had anything to do with the attack.

The rail and road links were cut by Serbian units last week.

Croatian troops had driven attacking Serbian units from the village on Wednesday.

In past weeks Serbian units have taken 300 of the blue helmets hostage, to use as pawns.

With him, they laughed when he was asked if there was any discrimination against him in the Serbian units.

"This was harrowing evidence of how the Serbian military units are being employed to force villagers from their homes," he said at a briefing today.

Rooting out Serbian armored units, by all accounts, is not a simple proposition.

The only effective opposition to the invasion was from wholly Serbian units within the borders of Serbia itself.