Oh dear! Swedish police find drugs and a stun gun on Justin Bieber's tour bus

Swedish police have found drugs on board pop sensation Justin Bieber's tour bus - they have reported.

Police spokesman Lars Bystrom says a small amount of drugs and a stun gun were found when officers raided the empty bus parked under the Globen concert venue in Stockholm, where Bieber was performing Wednesday.

Bieber apologised in January after being pictured smoking a suspicious looking cigarette in a hotel room with friends.

Bystrom said Thursday they have no suspects and no one has been arrested. He declined to identify the drug, saying it had been sent to a laboratory for an analysis.

He says police acted after smelling marijuana coming from inside the bus when it was parked outside the hotel where Bieber was staying. The drug squad was alerted and searched the bus during the concert.

Bieber is in Stockholm as part of a world tour and his behaviour has caused controversy in recent weeks.