Drugs found on Justin Bieber's tour bus in Sweden

Updated 2:32 p.m. ET

The list of troubles linked to Justin Bieber's European tour grew again after police in Stockholm, Sweden, said Thursday that they had found drugs and a stun gun on the pop singer's bus.

No arrests were made since the bus was empty at the time, Stockholm police spokesman Lars Bystrom told The Associated Press.

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Police said they decided to act after smelling marijuana coming from inside the bus while it was parked outside the hotel where Bieber was staying in the capital. Drug officers searched the bus during the concert while Bieber was on stage, Bystrom said.

He said a small amount of drugs and a stun gun were discovered during a search of the bus, which had been parked under the Globen concert venue in Stockholm, where Bieber was performing Wednesday. Bystrom declined to identify the drug, saying that it was sent to a lab for analysis.

Bieber, who arrived in Helsinki, Finland, later Thursday to perform a concert there the following evening, posted a message on Twitter after his arrival:

The incident is the latest on Bieber's tumultuous European tour, which has included a monkey detention, a Holocaust museum furor and a health scare.

In Britain, the 19-year-old singer struggled with his breathing and fainted backstage at a London show. He was taken to a hospital, only to be caught on camera clashing with paparazzi.

In Germany, the Canadian teenage idol had to leave his monkey in quarantine since he didn't have the necessary papers for the animal.

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Drugs found on Justin Bieber's tour bus in Sweden