Husby is a neighborhood in western Stockholm which in 2007 had just over 11,000 inhabitants, fully 81.9% of whom were immigrants or the children of immigrants. The other interesting fact in the brief Wikipedia entry on Husby is that the area contains "many runestones…remnants from when Vikings used to live here."
There are, alas, few other signs of the area's Viking heritage.
The story begins on May 14, when Stockholm police were forced to shoot a man who was wielding a machete at them. He died. The cops were immediately accused of police brutality. A "community group" called Megafonen urged locals to demonstrate "for social justice and against police violence."