Germany is expecting one million migrants and refugees this year - 200,000 more than previously estimated, Angela Merkel's deputy has said.

In a letter to party members, the country's vice chancellor, Sigmar Gabriel, said: "Everything points to the fact that we won't have 800,000 migrants as has been predicted by the Interior Ministry, but one million."

He also called for other EU nations to take their fair share of refugees, and warned a "common European effort" to tackle the crisis is badly needed.

Later today, the European Commission will formally outline its plans to distribute 160,000 refugees across 22 EU member states over the next two years - a policy several countries are opposed to.

Mr Gabriel's remarks came after Germany tightened controls along its border with Austria - creating traffic jams at major crossings.

Meanwhile, Austria's Chancellor has confirmed his country's military will be deployed to help police dealing with the influx of migrants along its borders if needed - but the focus of their support would be to provide "humanitarian help".

Migrants are crossing over from Hungary into Austria at their fastest rate yet - and according to an Austrian police spokesman, as many as 7,000 people had already arrived on Monday morning.

The spokesman also explained how Austria's main accommodation centres for the migrants - in Nickelsdorf and Parndorf - are full.

France is demanding for tighter controls at the borders of all European countries - most notably in Greece, Italy and Hungary.

The three countries are on the periphery of the EU, and have disproportionately had to deal with hundreds of thousands of people arriving by land and sea.

The French government wants greater manpower across the region to help sort refugees fleeing war-torn countries from economic migrants.