Germany voiced concern Monday about the risk of a "new intifada" following clashes in Jerusalem, three days ahead of a Berlin visit by Israeli Prime Minister Benjamin Netanyahu.

"What possibly awaits us here is something like a new intifada," said foreign ministry spokesman Martin Schaefer.

Germany could receive up to 1.5 million asylum-seekers this year, according to the Bild newspaper, quoting a confidential document containing estimates that are far higher than publicly released official figures.

Authorities have so far predicted that Europe's top economy would record between 800,000 and one million new arrivals in 2015.

Germany on Saturday celebrated 25 years since its joyful reunification, with its leaders urging the nation to muster the same strength and solidarity to face a record refugee influx.

The silver anniversary of the day communist East Germany and the capitalist West reunited as one country comes with Europe's top economy standing at a crossroads.

Speculation mounted Friday that Angela Merkel could scoop this year's Nobel Peace Prize for her leadership during Europe's migrant crisis after she was being tipped by one of Germany's leading newspapers and experts in Norway.

Ahead of the Nobel prize season beginning on Monday, Germany's influential Bild newspaper said Merkel, 61, had "a good chance" of winning, in part over her open-door policy on refugees fleeing war and persecution.

Germans are growing increasingly uneasy over the record influx of migrants coming to their country, costing Chancellor Angela Merkel voter support, a poll Friday indicated.

More than half -- 51 percent -- of respondents said the arrival of so many newcomers at once made them fearful, according to the survey for public broadcaster ARD.

Some 200 Syrian and Afghan refugees clashed in a crowded German refugee center in Hamburg overnight, leaving four people injured in the third such riot this week, police said Thursday.

Fifty police were called in to contain the mass brawl, which broke out in an argument in a shower block, local newspaper the Morgenpost reported.

A food queue fight in an overcrowded German refugee center this week escalated into a mass brawl pitting 70 Pakistanis against 300 Albanians, fighting with fists, sticks and pepper spray.

By the time it ended, 14 people were injured, including three of the 50 police called in to contain the riot in a former airport building housing 1,500 asylum-seekers from 20 nations near the central city of Kassel.

The Internal Security Forces arrested on Wednesday scores of Palestinians while trying to leave the port of the northern city of Tripoli on a migrant boat, the state-run National News Agency reported.

The ISF Intelligence Branch made the arrest of 40 Palestinians, including women, who reside in the southern refugee camp of Ain el-Hilweh, said NNA.

The U.N. chief's Deputy Special Coordinator for Lebanon, Philippe Lazzarini, has lamented that the response of the international community to the needs of Syrian refugees in Lebanon and other countries is weak.

In an interview with An Nahar daily published on Wednesday, Lazzarini said: “The response does not meet the needs.”

Germany toughened rules Tuesday for asylum seekers from the Balkans as Europe struggled to cope with a record surge in migrants, with those crossing the Mediterranean exceeding the half a million mark.

Berlin added Albania, Kosovo and Montenegro to a list of so-called safe origin countries, which will result in swifter deportations for asylum seekers from those conflict-free states, in a bid to free up resources to deal with claims from citizens of war-torn countries like Syria.