An older man died at a Swedish metro station Sunday after picking up what some suspect was a hand grenade.
He died in the hospital, police said on their website.
Police initially were investigating the incident as an attempted murder, but later said there was no reason to believe that the couple was targeted.
Although some media said that the object was a hand grenade, the police have not confirmed that information or the possibility that it was a terrorist act.
A 45-year-old woman was also injured in the blast.
The blast occurred mid-morning at the Varby gard station in Huddinge, a southern suburb of the Swedish capital.
A bomb squad is now on the scene, combing the station for additional explosives.
The female victim was said to have suffered wounds to her face and lower body. "We do not know more than that", Stockholm fire department spokesman Lars-Ake Stevelind told Sveriges Radio, according to Express.
According to the Local, "Explosives are often used by organised crime rings in Sweden, especially in the south where settling of scores and intimidation are frequent among drug traffickers".