More EU countries have said they are imposing border checks to deal with an influx of migrants.

Austria, Slovakia and the Netherlands said they would tighten controls, hours after Germany imposed checks on its border with Austria.

Hungary also completed a fence along its border with Serbia, and blocked a railway line used as a crossing point.

Meanwhile in Brussels, EU interior ministers agreed in principle to relocate 120,000 asylum seekers.

Luxembourg, which holds the EU presidency, said the decision was expected to be made law when ministers meet on 8 October.

There were no details on how the asylum seekers would be shared out among EU states. Some countries have opposed plans for mandatory quotas.

European states have been struggling to cope with a record influx of migrants, many aiming for Germany.