Boy, 8, killed in grenade attack on apartment in Sweden per BBC News

This BBC report http://www.bbc.co.uk/news/world-europe-37161752 ends rather interestingly:

'Sweden generally has low crime rates but police have had difficulty addressing violence in poorer neighbourhoods in Stockholm, Gothenburg and Malmo.

Over the course of the summer, cars have been set alight on an almost nightly basis in some neighbourhoods.'

Odd how I don't recall any previous BBC reports mentioning these car burnings in Sweden. I wonder if the perpetrators are in any way linked to those who burn cars in some French cities.