Police in Sweden say a man has been seriously injured after an explosion at a Stockholm subway station.
The blast took place at about 11am on Sunday, just outside the Varby Gard underground station in Huddinge, a residential district in greater Stockholm, said regional police spokesman Sven-Erik Olsson.
A woman sustained minor injuries to her legs and face.
Police told news agency TT that the killed man, who was in his 60s, and the injured woman, who is in her 40s, were a couple.
The Expressen and Aftonbladet newspapers said the device was a hand grenade.
"These two people cycled past the object and stopped to see what was on the ground".
Police checked in and around the subway station after the blast to make sure there were no other explosive devices.
Rescue official Lars-Ake Stevelind told Swedish broadcaster SVT that "someone has used some type of explosive material" for the object and that police were investigating it.
"It is too early to say".
Numerous illegal hand grenades found in Sweden are being imported from former Yugoslav nations, he said.