The event took place in a housing complex for refugees on March 20th in Fagersjö, a suburb just outside Stockholm and received attention in main-stream media as well, e.g. in Dagens Nyheter, Aftonbladet, Expressen and SVT. The press release from the Stockholm Police is not published anymore, but can be found in Google's web cache.
The perpetrator was a resident of the housing complex (so, most likely a refugee) and was arrested and accused of arson, damage to property, violence against enforcement officer, attempted violence against enforcement officer and disturbance.