Firefighters extinguish a burning car, following riots in the Stockholm suburb of Kista late May 21, 2013, in this picture provided by Scanpix. Sweden's capital has been hit by some of its worst riots... more 

Firefighters extinguish a burning car, following riots in the Stockholm suburb of Kista late May 21, 2013, in this picture provided by Scanpix. Sweden's capital has been hit by some of its worst riots in years after youths scorched dozens of cars, attacked a police station and threw stones at rescue services in its poor immigrant suburbs for the third night running. REUTERS/Fredrik Sandberg/Scanpix less