May 21 (AFP) - Between 500 and 600 Kosovo refugees arrived in Macedonia Friday, aboard six buses, at the border post of Blace, the refugee agency UNHCR said. Some of those arriving had been on the road for a month since being forced from their homes, travelling on tractors. They were robbed en route by masked men, and those without money for bribes were killed by police, UNHCR spokesman Ron Redmond cited the new arrivals as saying. Other refugees from the Kosovo capital Pristina said Serb police had threatened to kill them unless they left the area overnight. The UNHCR said in Geneva Friday that around 2,700 Kosovo Albanian refugees poured into Macedonia Thursday, the highest number for weeks. In Albania, the refugee flow has all but dried up, according to the UNHCR, with just 63 people from Kosovo arriving in the past eight days. The lack of arrivals into Albania indicated that "the Serbs might have practically severed that escape route," a spokesman in Geneva said Friday. --=-=-- 