Police in Gothenburg have found a bag containing what appears to be materials used for doping near the venue of the European Athletics Championships.
The suspect bag was found in a waste bin on a street within walking distance of the Ullevi Stadium, where the championships ended on Sunday.
"It contained what we believe is doping equipment, syringes and catheters," said Swedish police in a statement.
"Another bag was found later which had equipment for blood transfusions."
Police released a photograph of a blue bag full of used syringes, needles, tubes and small bottles.
"Most of what has been found has been used," the statement added.
No suspect has been identified linked to the bags and an investigation of the contents is now taking place.