Arriving refugees report seeing many corpses in Srebrenica's streets.
Several thousand new refugees were yesterday reported to have fled fighting near the town of Mostar.
The early refugees had reported killings by Serbian forces, but in small numbers.
The refugees who arrived during the day reported that they saw men lined up along the road in Meja.
Those refugees reported seeing another 3,000 civilians headed for Macedonia on the road behind them.
In addition, he said, refugees reported coming under attack by government forces, sometimes from the air.
But that number could be higher because the police said many more refugees might not have reported to Greek authorities.
Eleven refugees died, and surviving refugees reported that they had to wait more than 45 minutes before being released from their cell.
International human rights organisations and refugees reported on the atrocities in the town in 1992.
So far, none of the photographs have revealed mass graves or concentration camps, as some refugees have reported seeing, the officials said.