A man was killed and a woman injured in an explosion on Sunday outside a metro station in Stockholm, Sweden, police said.
A woman was also injured in the blast, at the Varby Gard station in the municipality of Huddinge, which is about 11 kilometers south of Stockholm. The couple had been cycling past the device when the man stopped to investigate it.
According to a Swedish police report published past year, Sweden is the European country where criminal gangs use the most grenades, often from stocks from the former Yugoslavia.
Officers say a 60-year-old man was hurt after picking up an object from the ground which exploded.
But police haven't confirmed the exact nature of the explosive device.
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Mr Alvarsjo said Swedish police have "unfortunately" noticed a rise in the use of hand grenades by criminal groups.
The Varby Gard station was cleared on Sunday and the Stockholm subway was partially shut, with replacement buses serving part of the route on the affected line.
So far, police did not say whether the explosion was a terror-related incident.
Police patrols have been stepped up in the area and investigations are taking place.