It seems to be anyone with connections to immigrants - and a dark skin is the most obvious visual identifier for the gunman to use, I suppose:
The apparent murder victim was a 20-year-old woman named Trez West Persson, who was shot in a parked car with her immigrant boyfriend on 10 October last year. Since he was newly released from prison, the police originally assumed he was a gang target, but they now suppose the pair was attacked because of the colour of his skin.
Suspected targets since then have included one of the city's mosques and a police station. In another incident, a group of African men were fired on outside one of the city's swimming pools. In all, police said there was no obvious motive in 19 of the 50 shootings recorded in the city since last October.
http://www.guardian.co.uk/world/2010/oct/25/gang-swedish-police-racist-attacks"I'm almost afraid of turning on the light in my apartment at night now," Shukrije Berisha, who lives in the same building, told Svenska Dagbladet.
In similar incidents, two men of an "ethnic minority background" recently were shot while waiting at bus stops, according to police.
...
Basi Hassan, one of the bus stop victims, told TV4, "I was standing here at the bus stop when I suddenly heard a shot. I don't know where it came from. Then I saw my own blood and I started feeling dizzy."
http://edition.cnn.com/2010/WORLD/europe/10/26/sweden.serial.shooter/So there have been Africans, Muslims, a woman with a typical Swedish name but a dark skinned boyfriend; an Iranian, someone with a typical Middle Eastern name, and "Shukrije Berisha", a name I can't make a guess at the origin of. The guy want to shoot immigrants, it seems, and that includes Eastern Europeans along with others.