Austrian authorities said they were expecting another wave of migrants and refugees coming over the border from Hungary on Sunday, after a brief lull in arrivals gave them a chance to re-stock reception centers.
Austria struggled last week to cope with thousands of people entering its territory, almost all of them on their way to Germany. The train link to Hungary has been closed since Thursday in a bid to stem the flow.
Only 50 people crossed the border early on Sunday morning, but Hungarian authorities had said more were on their way and numbers could climb to 500 an hour, a spokesman for the Austrian police said.
Based on recent experience, the Austrian authorities were expecting 6,000-8,000 new arrivals through the day, the spokesman added.