Swedish police said a masked gunman carried out a shooting that killed three people. The motive of the shooting was as of yet unclear, with police investigating it as a homicide.

Sweden has suffered from a wave of gang-related violence for more than a decade that has included an epidemic of gun violence.

Swedish police have arrested a teenager after three youths aged between 15 and 20 were killed in a shooting at a hair salon, authorities said, amid rising concern over gang violence in the Scandinavian nation.