"These two people cycled past the object and stopped to see what was on the ground. This is totally unacceptable", Alvarsjo said.
Tabloids Aftonbladet and Expressen reported that the blast was thought to have been caused by a hand grenade, but police spokesman Sven-Erik Olsson declined to confirm the reports. "It is surprising they have not detonated earlier", Alvarsjo said. The man has been taken to hospital. The man and the woman simply "were at the wrong place and at the wrong time".
Stockholm County Police said a man, reportedly aged 60, had been hurt after picking an object off the ground.
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Police checked in and around the station after the blast to make sure there were no other explosive devices. "Nothing indicates that the (inju-red) couple were targeted", said Olsson, adding there was nothing to suggest terrorism.
A second person was injured in the explosion, which occurred at the Varby Gard station in the south of the city.