Germany's vice chancellor says the country can expect 1 million migrants this year, raising the previous estimate by 200,000.

Sigmar Gabriel said in a letter to members of his Social Democratic Party that "everything points the fact that we won't have 800,000 migrants as has been predicted by the Interior Ministry but 1 million."

In the letter, Gabriel called for other European countries to do more, saying there had to be a "common European effort" to tackling the refugee crisis. Germany takes in more asylum seekers than any other EU nation by far.

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Over 5,800 people fleeing their homelands have entered Hungary in one day, by far the highest number this year, as the country prepares to apply new immigration rules and tighter border controls.

Hungarian police detained 5,809 migrants Sunday, shattering the previous one-day mark of 4,330 set Saturday.

By 8 a.m. Monday, police said another 3,280 people had been detained for crossing the border illegally, taking Hungary's 2015 total to nearly 195,000.

Hungarian authorities hope reinforced border patrols, a 4-meter (13-feet) high fence on the border with Serbia and new laws criminalizing those entering Hungary illegally or cutting through the fence will deter migrants from coming to Hungary as they try to make their way to Germany and other, wealthier EU nations.

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The Austrian chancellor says the country's military will be deployed to help police dealing with the influx of migrants on the country's border if needed.

Werner Faymann said Monday that the government approved a request from the Interior Ministry for assistance from the army, the Austria Press Agency reported.

Faymann said the army will focus on providing humanitarian help inside Austria but soldiers will be deployed to help at the borders if required.

Austria is seeing a constant stream of refugees across the border from Hungary.

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Greece's coast guard is still searching the area off the remote island of Farmakonissi after a wooden boat carrying migrants and refugees from the nearby Turkish shore sank, killing at least 34 people, including 15 children.

Two coast guard vessels and a diving team were searching the area Monday for any more potential bodies or survivors. Merchant Marine Minister Christos Zois flew to the island to be briefed on the operation.

The boat sank Sunday in rough seas and high winds. The coast guard rescued 68 people from the sea, while a further 30 managed to swim to Farmakonissi.

Separately, the coast guard said it had rescued 1,429 people at sea in 58 incidents off the islands of Lesbos, Chios, Samos, Agathonissi, Kos, Symi and Rhodes over the weekend, from Friday morning until Monday morning.