GETTY The leaked report warned of a dramatic rise in crime committed by refugees

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The shocking report also warns immigration will lead to more crime and increased "police usage to combat it". Titled 'Challenges To and Impact on the Police' was leaked to the news magazine Spiegel.

GETTY The paper warned attacks on migrants may increase

The number of crimes involving violence, sexual attacks, property theft and narcotic offences, will rise, according to the paper of the North Rhine-Westphalian department of the interior whose 'Immigration' project involves both individual states and central government.

Cultural, ethnic and religious conflicts in the accommodation, the spatial narrowness, lack of privacy and the considerable consumption of alcohol triggered conflicts The leaked report

North Rhine-Westphalia is the state in which Cologne lies, scene of the New Year's Eve sexual frenzy when mobs of immigrant men attacked hundreds of women, robbing and molesting them as police lost control of the situation. The report spoke of an "enormous additional burden" for police forces arising out of the refugee crisis. In North Rhine-Westphalia last year police had to respond 93,000 times to violence in refugee centres as "cultural, ethnic and religious conflicts in the accommodation, the spatial narrowness, lack of privacy and the considerable consumption of alcohol triggered conflicts. Resulting consequences must be drawn." At the same time as predicting higher crime, the confidential paper warns of fears that attacks on migrants and their accommodation, and "right-wing agitation," may increase.

GETTY The vast majority of refugees commit no crime the report concluded

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The risk-analysis paper comes as Germany continues to struggle to find a way to stem the unceasing tide of refugees across its borders. One leading criminal specialist wrote in the paper that police must be alert to possible negative developments of objective security as well as critical aspects of the police performance of duties. A report from late last year by the Federal Criminal Office (BKA) painted an incomplete picture of criminality among refugees because three out of 16 federal states did not provide crime figures for the study.

GETTY Increased police usage was predicted in order to combat the crime surge

It said that the 1.1 million migrants registered in 2015 committed over 200,000 crimes, two thirds of which involved property theft, counterfeiting and financial crimes. About 18 percent are so-called raw offences - injuries, threats and coercion. Sexual attacks did not make even one per cent of the crimes and the BKA concluded: "The vast majority of asylum seekers commit no crimes."