Lise and Kjetil Ulvestrand came to this town south of Oslo in 2005 for the space, the views, the forest and the cheaper rents. Ms. Ulvestrand, a former development worker in Latin America and a social worker with Norway's immigrants, says she is comfortable around foreigners and different cultures.
But as the number of immigrants, including Muslims, gradually increased in Mortensrud, she began to worry about her children and their education.
"I loved the forest and had friends, but ethnic Norwegians were moving out, so my children were losing friends," she said. "After a while we discovered that when kids were 5 or 6, everyone moved out. We wanted a stable environment, and we had some questions about the social challenges at the school," where the number of people who are not ethnic Norwegians was growing rapidly.