Swedish police say that an 8-year-old boy was killed in a hand grenade attack at an apartment in the southwestern city of Goteborg early Monday.

Goteborg police spokesman Peter Adlersson says the boy, who died on the way to a hospital, was visiting a family that lived in the third floor apartment when the explosion occurred early Monday. He didn't have details of other possible injuries.

Swedish media speculated that the attack might be linked to a feud between rival gangs in the region, citing police as saying a man convicted of a fatal shooting in the area last year was registered at the address.

Last year, a 4-year-old girl died in a car explosion connected to ongoing gang wars in Sweden's second-largest city.