Swedish police say they have found drugs on Justin Bieber's tour bus.

The singer is currently in the country on his Believe world tour and Stockholm police confirmed they searched his bus after an officer smelled marijuana coming from the vehicle.

The bus was searched on Wednesday (April 24) during the singer's concert in the city. A police spokesman said today (April 25):

"The police went onto the bus and searched it and found a small amount of narcotics. We don't know who had the drugs or who smoked them, so it will be hard to link them with any individual."

The drugs have been sent for analysis and the police have no suspects in mind. It has been reported that a stun gun was also found on the bus.