Effects

Overrepresentation in crime

http://jyllands-posten.dk/opinion/breve/ECE6618407/integrationen-gar-darligt/

Police won't hand stolen caravan back to couple to protect human rights of the travellers living in it

http://www.dailymail.co.uk/news/article-2381292/Police-wont-hand-stolen-caravan-couple-protect-human-rights-travellers-living-it.html

Immigrants create overcrowding and fuel tensions, report finds

http://www.telegraph.co.uk/news/politics/10158678/Immigrants-create-overcrowding-and-fuel-tensions-report-finds.html

Stockholm University exchange students have been told to leave their accommodation immediately after a community travellers set up an illegal camp nearby, raising concerns for the students' safety.

http://www.thelocal.se/48504/20130614/

Stockholm burns as rioters battle police after three days of violence in immigrant 'ghetto

http://www.dailymail.co.uk/news/article-2328952/Sweden-riots-Stockholm-burns-rioters-battle-police-days-violence-immigrant-ghetto.html

Police arrest 4 after second night of riots in Stockholm suburb triggered by police shooting

http://www.washingtonpost.com/world/europe/police-arrest-4-after-second-night-of-riots-in-stockholm-suburb-triggered-by-police-shooting/2013/05/21/0ad9e7c6-c208-11e2-9642-a56177f1cdf7_story.html

Lowered solidarity, altruism, trust and cooperation

In the long run immigration and diversity are likely to have important cultural, economic, fiscal, and developmental benefits. In the short run, however, immigration and ethnic diversity tend to reduce social solidarity and social capital. New evidence from the US suggests that in ethnically diverse neighborhoods residents of all races tend to ‘hunker down’. Trust (even of one's own race) is lower, altruism and community cooperation rarer, friends fewer.

http://onlinelibrary.wiley.com/doi/10.1111/j.1467-9477.2007.00176.x/abstract

Immigrant workers undermine wage growth 

Immigrant workers, mainly from other Nordic countries, have a negative effect on the pay checks of Norwegian employees. Workers with minimal skills and little experience are the most vulnerable.

http://sciencenordic.com/immigrant-workers-undermine-wage-growth