Germany will raise its forecast for the number of refugees expected this year from a previous 450,000 to at least 650,000, a German newspaper said on Tuesday, citing government sources.

The "Handelsblatt" said in its report that Interior Minister Thomas de Maiziere, who is scheduled to present a new prognosis by the Federal Office for Migration and Refugees on Wednesday, will say that the number of asylum-seekers coming to Germany in 2015 could go as high as 750,000.

According to the paper, a survey of governments of German states has shown that refugee numbers have swollen greatly over the summer.

In the city-state of Hamburg, for example, more than 7,300 people applied for asylum in the second quarter of the year in comparison with around 6,700 in the first quarter, while 5,700 put in an application in July alone, the paper said.

A similar situation prevailed in Baden-Württemberg, where the number of asylum applications reached 7,065 in July, twice the number seen in May, according to the report.

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